不结球白菜表皮蜡质高温胁迫生理响应

为了明晰高温胁迫下表皮蜡质在不结球白菜生理响应中的保护作用,该研究以不结球白菜有蜡(Q28)和无蜡(Q1202)品种为试验材料,设置高温胁迫组(昼/夜温度为37℃/30℃)和对照组(昼/夜温度为25℃/18℃)处理,观察不同材料叶片表皮细胞形态,比较分析高温胁迫处理下不同时期生理和光合指标变化的差异.结果 表明:(1)...

Physiological Response of Epidermal Wax in Non heading Chinese Cabbage under High Temperature Stress

In order to clarify the protective effect of epidermal wax in the physiological response to non-heading Chinese cabbage under high temperature stress,we used waxy(Q28)and waxless(Q1202)varieties of non-heading Chinese cabbage as experimental materials under high temperature stress in this study.The experiment set the high temperature stress group(day/night temperature of 37℃/30℃)and control group(day/night temperature of 25℃/18℃)to observe the morphology of leaf epidermal cells of different materials.Measure and compare the differences in physiological and photosynthetic index changes in different periods of high temperature stress.The results showed that:(1)the biomass of the two non-heading Chinese cabbage seedlings was inhibited from varying degrees under high temperature stress,and the decline in the waxy material was smaller;the leaf epidermal cell morphology also had a big difference.The shrinkage of epidermal cells of the material leaves was significantly lower than that of the wax-free material.(2)The contents of proline,soluble sugar and soluble protein in the waxed material leaf was significantly higher than that of the wax-free material at 9 days of high temperature stress.(3)The antioxidant enzyme activities of the two materials showed a dynamic change that first increased and then decreased,and the activities of the waxy material were greater;the malondialdehyde content and relative conductivity of the two materials showed an upward trend,and the waxy material increasedless.(4)The chlorophyll content of the leaves of the two materials showed a downward trend,but the waxy material was still higher;compared with the wax-free material,the waxy material leaves had a lower transpiration rate and a higher net photosynthetic rate.Studies have revealed that under high temperature stress,leaf wax can improve leaf osmotic adjustment ability,protect the normal morphology of leaf epidermal cells,and enhance plant antioxidant capacity.