摘要
【目的】研究小麦叶片逆向衰老过程中旗叶和倒二叶叶绿素含量、净光合速率、蒸腾速率和气孔导度的变化规律,为进一步揭示叶片逆向衰老的生理机制提供研究思路和理论指导。【方法】以逆向衰老小麦‘温麦19’和‘兰考矮早8’为试验材料,在小麦扬花后6,12,18,24,30和36d,分别采用CCM-200手持式叶绿素仪和LI-6400XT型便携式光合测定系统,在田间测定旗叶和倒二叶的叶绿素含量、净光合速率、蒸腾速率和气孔导度。【结果】‘温麦19’和‘兰考矮早8’在灌浆结实后期(花后18～36d)均出现倒二叶叶绿素含量高于旗叶的现象,即叶片逆向衰老的现象;‘温麦19’较‘兰考矮早8’叶片逆向衰老现象出现早。在灌浆后期,‘温麦19’旗叶的光合速率、蒸腾速率和气孔导度均低于倒二叶,而‘兰考矮早8’旗叶的光合速率低于倒二叶,蒸腾速率和气孔导度仍高于倒二叶。【结论】在逆向衰老过程中,随着小麦旗叶和倒二叶叶绿素含量的变化,其净光合速率、蒸腾速率和气孔导度也发生相应的变化,且品种之间存在较大差异。
【Objective】 Wenmai 19 and Lankaoaizao 8 were chosen as material to reveal the changing law of chlorophyll content,photosynthetic rate,transpiration rate and stomata conductance of the flag leaves and the penultimate leaves.We intended to provide research thought and academic guidance of announcing the physiological mechanism of inverted senescing leaves.【Method】 The study measured the chlorophyll content,photosynthetic rate,transpiration rate and stomata conductance of the flag leaves and the penultimate leaves respectively by using chlorophyll measuring system in hand and a portable LI-6400 photosynthesis system in 6 d,12 d,18 d,24 d,30 d and 36 d after flowering.【Result】 Both Wenmai 19 and Lankaoaizao 8 presented higher chlorophyll content in the penultimate leaves than the flag leaves,i.e.,inverted senescing sequence in wheat leaves.Inverted senescing sequence in wheat leaves presented earlier in Wenmai 19;and the index of photosynthetic rate,transpiration rate and stomata conductance were lower in the flag leaves than the penultimate leaves in the late fruiting age.The photosynthetic rate of Lankaoaizao 8 in the flag leaves was lower,but the transpiration rate and stomata conductance were higher than the penultimate leaves.【Conclusion】 In the process of inverted senescing sequence in wheat leaves,with the appearance of inverted sequence in chlorophyll content of the flag leaves and the penultimate leaves,photosynthetic rate,transpiration rate and stomata conductance presented the corresponding change and there were differences between varieties.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2013年第6期44-48,共5页
Journal of Northwest A&F University(Natural Science Edition)
基金
国家自然科学基金项目(31170366)
关键词
小麦
逆向衰老
叶绿素
光合作用
wheat
inverted senescing sequence
chlorophyll
photosynthesis
