@article{jafarikouhini_sinclair_2024, title={Recovery of root hydraulic conductance and xylem vessel diameter following prolonged water deficit of maize}, ISSN={["1435-0653"]}, DOI={10.1002/csc2.21161}, abstractNote={Abstract}, journal={CROP SCIENCE}, author={Jafarikouhini, Nahid and Sinclair, Thomas R.}, year={2024}, month={Jan} }
 @article{sinclair_jafarikouhini_pradhan_2024, title={Unexpectedly, triple super phosphate fertilizer induces maize drought resilience}, ISSN={["1532-4087"]}, DOI={10.1080/01904167.2024.2325948}, abstractNote={Phosphorus fertilizer is commonly applied to soils in crop production as diammonium phosphate (DAP). To decrease ammonium addition to the environment, triple super phosphate (TSP) is being considered as a DAP replacement. This study was undertaken to compare the response of maize plants to soil fertilization with TSP vs. DAP under well-watered conditions, under soil-drying conditions, and root hydraulic conductance. It was found for well-watered conditions in a controlled environment that there was no difference in plant growth between DAP to TSP treatments. In soil dry-down experiments, however, the initiation of the decrease in transpiration rate was unexpectedly quite different between DAP and TSP treatments. The soil water content threshold for initiation of decrease in transpiration rate with DAP treatment (average fraction transpirable soil water for two experiments = 0.285) was consistent with common observations, but the threshold associated with TSP treatment occurred at an unusually high soil water content (average fraction transpirable soil water for two experiments = 0.545). The higher threshold with TSP resulted in an extended period of soil water use, i.e. soil water conservation. Soil water conservation resulting from the TSP treatment was associated with a 27% greater shoot mass accumulation following a 4-wk re-watering period after the water-deficit treatment than measured with the DAP treatment. The high threshold for decrease in transpiration resulting from TSP was consistent with measured lower root hydraulic conductance as compared to DAP treatment. The unexpected discovery of TSP-induced initiation of transpiration rate decrease at high soil water content is consistent with greater crop drought resilience.}, journal={JOURNAL OF PLANT NUTRITION}, author={Sinclair, Thomas R. and Jafarikouhini, Nahid and Pradhan, Deepti}, year={2024}, month={Feb} }
 @article{jafarikouhini_sinclair_2023, title={Hydraulic conductance and xylem vessel diameter of young maize roots subjected to sustained water-deficit}, ISSN={["1435-0653"]}, DOI={10.1002/csc2.21023}, abstractNote={Abstract}, journal={CROP SCIENCE}, author={Jafarikouhini, Nahid and Sinclair, Thomas R.}, year={2023}, month={May} }
 @article{echarte_sinclair_jafarikouhini_2023, title={Maize leaf rolling and its response to drying soil and evaporative demand}, ISSN={["1435-0653"]}, DOI={10.1002/csc2.21002}, abstractNote={Abstract}, journal={CROP SCIENCE}, author={Echarte, Laura and Sinclair, Thomas. R. R. and Jafarikouhini, Nahid}, year={2023}, month={May} }
 @article{jafarikouhini_sinclair_resende_2022, title={Comparison of water flow capacity in leaves among sweet corn genotypes as basis for plant transpiration rate sensitivity to vapor pressure deficit}, ISSN={["1435-0653"]}, DOI={10.1002/csc2.20711}, abstractNote={Abstract}, journal={CROP SCIENCE}, author={Jafarikouhini, Nahid and Sinclair, Thomas R. and Resende, Marcio F., Jr.}, year={2022}, month={Feb} }
 @article{sinclair_jafarikouhini_2022, title={Plant waterflow restrictions among sweet corn lines related to limited-transpiration trait}, ISSN={["1435-0653"]}, DOI={10.1002/csc2.20717}, abstractNote={Abstract}, journal={CROP SCIENCE}, author={Sinclair, Thomas R. and Jafarikouhini, Nahid}, year={2022}, month={Apr} }
 @article{chiango_jafarikouhini_pradhan_figueiredo_silva_sinclair_holland_2021, title={Drought resilience in CIMMYT maize lines adapted to Africa resulting from transpiration sensitivity to vapor pressure deficit and soil drying}, volume={8}, ISSN={["1542-7536"]}, DOI={10.1080/15427528.2021.1961334}, abstractNote={ABSTRACT Low rainfall limits crop yield, particularly for maize (Zea mays L.) in southern Africa. Consequently, there is a need to identify genetic sources of specific drought-related traits that can contribute to soil water conservation and increased yields under water-limited conditions. In this study, maize genotypes released for production in southern Africa were tested for expression of two soil water-conservation traits: limited transpiration under elevated vapor pressure deficit (VPD) and decreased transpiration rate at high soil water contents earlier in the soil drying cycle. Two genotypes, CML 590 and CML 593, were identified and confirmed to initiate expression of limited-transpiration rate at VPD above about 1.9 kPa. In the soil-drying experiment, Umbelu 8923 and Umbelu 8930 closed their stomata earliest in the soil drying cycle as compared to other tested genotypes. These four genotypes with specific physiological traits for superior response to water deficit are genetic resources for further study to improve maize drought resilience.}, journal={JOURNAL OF CROP IMPROVEMENT}, author={Chiango, H. and Jafarikouhini, N. and Pradhan, D. and Figueiredo, A. and Silva, J. and Sinclair, T. R. and Holland, J.}, year={2021}, month={Aug} }
 @article{jafarikouhini_kazemeini_sinclair_2021, title={Fresh sweet corn yield sensitivity to deficit nitrogen and water conditions}, ISSN={["1542-7536"]}, DOI={10.1080/15427528.2021.1995560}, abstractNote={ABSTRACT Water and nitrogen (N) are the major limitations for maximizing crop yield. However, there has been no detailed examination of these limitations on fresh kernel yield in sweet corn (Zea mays L.). A two-year field study in Shiraz, Iran, was conducted to document sweet corn response to three soil-water regimes (irrigation to field capacity, and 80% and 60% of this amount) and five N fertilizer amounts (0, 75, 125, 175, and 225 kg N ha−1). Decreasing irrigation to 60% of field capacity resulted in yield decreases. The results showed that increasing N amounts increased fresh kernel yield to a maximum at 175 and 225 kg N ha−1. A highly positive, linear correlation was found between fresh kernel yield and kernel number formed per ear (R2 = 0.94), and also between kernel fresh yield and total crop mass (R2 = 0.88). Harvest index (HI) based on dry kernel weight varied between 0.20 and 0.41 in the two years with the lowest HI occurring in the 0 and 75 kg N ha−1 treatments.}, journal={JOURNAL OF CROP IMPROVEMENT}, author={Jafarikouhini, Nahid and Kazemeini, Seyed Abdolreza and Sinclair, Thomas R.}, year={2021}, month={Oct} }
 @article{sinclair_jafarikouhini_2021, title={Interactive effects of level of nitrogen and irrigation application on maize yield}, ISSN={["1532-4087"]}, DOI={10.1080/01904167.2021.2020835}, abstractNote={Abstract Maize (Zea mays L.) yields are recognized to be sensitive to both the level of nitrogen fertilization and irrigation that is applied to the crop. However, there are virtually no studies where experimental results are analyzed to quantitatively explore directly the interactive influence of these two resources on yield. As a consequence, it is difficult to sort out the optimum management regime for the available resources. A polynomial regression analysis was applied to results from seven field experiments involving several nitrogen and irrigation treatments. The polynomial equation included for each resource a linear term and second-order term plus a multiplicative term of the two resources. The polynomial regression fit very well the results of all experiments (R2 ≥ 0.86). The impact of irrigation included the linear term in all experiments (p ≤ 0.017). In all but one experiment, yield was also linearly dependent on amount of nitrogen application. The polynomial expression led to determination of the nitrogen fertilization required for maximum yield as being dependent on level of irrigation. In all cases, increased irrigation amounts resulted in an increased nitrogen requirement to achieve maximum yield. Another important outcome of the analysis was that the multiplicative term for irrigation x nitrogen was generally important in describing yield. These results demonstrate the inadequacy of attempting to define the results of such multiple-factor experiments based on a single limiting-factor approach.}, journal={JOURNAL OF PLANT NUTRITION}, author={Sinclair, Thomas R. and Jafarikouhini, Nahid}, year={2021}, month={Dec} }
 @article{jafarikouhini_sinclair_resende_2021, title={Limited-transpiration rate and plant conductance in a diverse sweet corn population}, ISSN={["1435-0653"]}, DOI={10.1002/csc2.20664}, abstractNote={Abstract}, journal={CROP SCIENCE}, author={Jafarikouhini, Nahid and Sinclair, Thomas R. and Resende, Marcio F. R.}, year={2021}, month={Dec} }
 @article{jafarikouhini_pradhan_sinclair_2020, title={Basis of limited-transpiration rate under elevated vapor pressure deficit and high temperature among sweet corn cultivars}, volume={179}, ISBN={1873-7307}, DOI={10.1016/j.envexpbot.2020.104205}, abstractNote={One plant trait that has been developed in several crop species to increase the effectiveness in water use through the cropping season is limited-transpiration under elevated atmospheric vapor pressure deficit (VPD). This trait allows water conservation early in the season so that there is more soil water available late in the season for sustained physiological activity during seed development. In sweet corn (Zea mays L. saccharata), where the quality of the kernels is important, this trait could prove to be especially beneficial. The background objective of this study was to explore 16 sweet corn cultivars for expression of the limited-transpiration trait. It was found at 32 °C that 13 of the 16 cultivars expressed the trait. It was found in a subset of eight of these cultivars, however, only half retained the limited-transpiration trait at 38 °C. The additional objectives were to explore the hypotheses that expression of the limited-transpiration trait was related to plant hydraulic conductance, and to the abundance of silver-sensitive aquaporins in the leaves. In cultivars that lost expression of the limited-transpiration trait at 38 °C there were large increases in plant hydraulic conductance at 38 °C as compared to 32 °C. Abundance of silver-sensitive aquaporins was related to the transpiration rate under low VPD conditions. That is, those cultivars with more abundant silver-sensitive aquaporins had greater transpiration rates as a result of greater stomatal conductance. These results showed that while expression of the limited-transpiration trait in sweet corn at 32 °C was common, differences in expression of the trait at 38 °C were observed due to differences in plant hydraulic conductance and stomatal conductance.}, journal={ENVIRONMENTAL AND EXPERIMENTAL BOTANY}, author={Jafarikouhini, Nahid and Pradhan, Deepti and Sinclair, Thomas R.}, year={2020}, month={Nov} }
 @article{jafarikouhini_kazemeini_sinclair_2020, title={Sweet corn nitrogen accumulation, leaf photosynthesis rate, and radiation use efficiency under variable nitrogen fertility and irrigation}, volume={257}, ISSN={["1872-6852"]}, DOI={10.1016/j.fcr.2020.107913}, abstractNote={Virtually no information exists on the response of sweet corn (Zea mays L. saccharata) to nitrogen fertility and irrigation treatments in terms of leaf nitrogen accumulation and the consequent impact on leaf CO2 assimilation rate and on crop growth as measured as radiation use efficiency (RUE). A two-year field experiment was undertaken in which a sweet corn cultivar was subjected to all combinations of five nitrogen fertility and three irrigation treatments. Leaf photosynthesis measurements were made at stages of 7–9 leaves, tasseling, silking, blistering, and milking. Leaf nitrogen per unit area was also measured at these five stages plus two additional stages before and after the five core measurements. Total nitrogen and plant mass was accumulated at the seven stages to track total nitrogen accumulation and to calculate RUE. The overall patterns in the measured variables were similar to those reported for field maize. However, leaf nitrogen per unit area for sweet corn under optimum conditions was greater than reported for field maize. The higher leaf nitrogen per unit area in sweet corn did not, however, result in greater leaf photosynthesis rates and RUE than reported for field maize. The results of these unique observations on sweet corn indicate the possibility of greater nitrogen storage in sweet corn leaves that is not directly linked with photosynthesis and carbon accumulation.}, journal={FIELD CROPS RESEARCH}, author={Jafarikouhini, Nahid and Kazemeini, Seyed Abdolreza and Sinclair, Thomas R.}, year={2020}, month={Oct} }