Effects of water deficit and nitrogen application on leaf gas exchange, phytohormone signaling, biomass and water use efficiency of oat plants
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Effects of water deficit and nitrogen application on leaf gas exchange, phytohormone signaling, biomass and water use efficiency of oat plants. / Li, Li; Ma, Haiyang; Xing, Jiayi; Liu, Fulai; Wang, Yaosheng.
In: Journal of Plant Nutrition and Soil Science, Vol. 183, No. 6, 2020, p. 695-704.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Effects of water deficit and nitrogen application on leaf gas exchange, phytohormone signaling, biomass and water use efficiency of oat plants
AU - Li, Li
AU - Ma, Haiyang
AU - Xing, Jiayi
AU - Liu, Fulai
AU - Wang, Yaosheng
PY - 2020
Y1 - 2020
N2 - Background: Water and nitrogen (N) are essential resources influencing plant growth and yield. To improve their efficiencies in crop production is challenging because the physiological mechanisms of water and N coupling and their interactive effect on crop water use efficiency (WUE) are not well understood yet.Aim: The aim of this study was to investigate the physiological responses and phytohormones signaling in oats in response to soil water status and N supply under fertigation, to explore the mechanisms regulating plant growth and WUE.Methods: Oat plants were subjected to the factorial combination of three soil moisture regimes (50, 70, and 90% of soil water holding capacity, SWHC) and three N levels (fertilized with 74, 149, and 298 mg kg(-1)).Results: The stomatal conductance (g(s)) was significantly decreased by soil water deficit, and also by the highest N level, whereas photosynthesis rate (A(n)) was unaffected by neither water nor N. Consequently, intrinsic WUE (WUEint, A(n)/g(s)) was highest under reduced irrigation and high N fertilization. This effect at stomatal level was affirmed by responses in whole plant WUE (WUEb), which was positively correlated with shoot delta C-13. A positive correlation between delta O-18 and delta C-13 in shoots further indicated that decreases of g(s)rather than changes in A(n)contributed to the enhanced WUE.Conclusion: Moderate soil water deficit and sufficient N supply is recommended for saving irrigation water and improving WUE on fertigated oat plants without compromising biomass accumulation to any large extent.
AB - Background: Water and nitrogen (N) are essential resources influencing plant growth and yield. To improve their efficiencies in crop production is challenging because the physiological mechanisms of water and N coupling and their interactive effect on crop water use efficiency (WUE) are not well understood yet.Aim: The aim of this study was to investigate the physiological responses and phytohormones signaling in oats in response to soil water status and N supply under fertigation, to explore the mechanisms regulating plant growth and WUE.Methods: Oat plants were subjected to the factorial combination of three soil moisture regimes (50, 70, and 90% of soil water holding capacity, SWHC) and three N levels (fertilized with 74, 149, and 298 mg kg(-1)).Results: The stomatal conductance (g(s)) was significantly decreased by soil water deficit, and also by the highest N level, whereas photosynthesis rate (A(n)) was unaffected by neither water nor N. Consequently, intrinsic WUE (WUEint, A(n)/g(s)) was highest under reduced irrigation and high N fertilization. This effect at stomatal level was affirmed by responses in whole plant WUE (WUEb), which was positively correlated with shoot delta C-13. A positive correlation between delta O-18 and delta C-13 in shoots further indicated that decreases of g(s)rather than changes in A(n)contributed to the enhanced WUE.Conclusion: Moderate soil water deficit and sufficient N supply is recommended for saving irrigation water and improving WUE on fertigated oat plants without compromising biomass accumulation to any large extent.
KW - delta C-13
KW - drought stress
KW - nitrogen
KW - phytohormone
KW - CARBON-ISOTOPE DISCRIMINATION
KW - SOLANUM-TUBEROSUM L.
KW - STOMATAL CONDUCTANCE
KW - ABSCISIC-ACID
KW - TRANSPIRATION EFFICIENCY
KW - HORMONAL CHANGES
KW - STABLE OXYGEN
KW - WINTER-WHEAT
KW - DURUM-WHEAT
KW - ROOT-GROWTH
U2 - 10.1002/jpln.202000183
DO - 10.1002/jpln.202000183
M3 - Journal article
VL - 183
SP - 695
EP - 704
JO - Journal of Plant Nutrition and Soil Science
JF - Journal of Plant Nutrition and Soil Science
SN - 1436-8730
IS - 6
ER -
ID: 249858865