外源褪黑素对干旱胁迫下大豆鼓粒期生理和产量的影响
Effects of exogenous melatonin on physiology and yield of soybean during seed filling stage under drought stress
A: 净光合速率; B: 气孔导度; C: 蒸腾速率; D: 胞间二氧化碳浓度; E: 水分利用率; F: 核酮糖-1,5-二磷酸羧化酶。WW: 鼓粒期开始保持80%田间持水量叶片喷施5 d清水对照; D: 鼓粒期开始停止供水保持50%田间持水量叶片喷施5 d清水干旱胁迫处理; MT+D: 鼓粒期开始停止供水保持50%田间持水量叶片喷施5 d 100 μmol L-1褪黑素加干旱胁迫处理。10: 不同处理10 d后第1次取样, WW维持80%田间持水量, D和MT+D停止供水达到50%田间持水量; 17: 不同处理17 d后第2次取样, WW维持80%田间持水量, D和MT+D第1次取样结束后维持50%田间持水量; 24: 不同处理24 d后第3次取样, WW维持80%田间持水量, D和MT+D第2次取样结束后继续维持50%田间持水量。标以不同字母的柱值在P < 0.05水平上差异显著。
A: net photosynthetic rate; B: stomatal conductance; C: transpiration rate; D: intercellular carbon dioxide concentration; E: water use efficiency; F: ribulose-1,5-bisphosphate carboxylase. WW: keeping 80% of the field water holding capacity, from the beginning of the seed filling stage, and leaf spray with water for 5 d; D: no water supply and maintain 50% of the field water holding capacity at seed filling stage, and leaf spray with water for 5 d; MT+D: no water supply and maintaining 50% of the field water holding capacity at seed filling stage, and leaf spray with 100 μmol L-1 melatonin plus drought stress for 5 d. 10: the first sampling after 10 d of different treatments, at that time WW maintained 80% of field water holding capacity, D and MT+D stopped water supply water to reach 50% of field water holding capacity; 17: the second sampling after 17 days of different treatments, at that time WW maintained 80% of field holding water volume, D and MT+D maintained 50% field water holding capacity after the first sampling; 24: the third sampling after 24 days of different treatments, at that time WW maintained 80% field water holding capacity, D and MT+D maintained 50% field water holding capacity after the second sampling. Bars superscripted by different letters are significantly different at P < 0.05.
