温度与水分状况对作物叶片延伸生长的影响

Effects of water status and temperature on leaf growth.

在实验室条件下通过对春小麦和夏玉米生长中叶片延伸速率(LER)、渗透势(Ψ_S)、叶水势(Ψ_L)的测定,研究温度与水分胁迫对春小麦和夏玉米叶片延伸生长的影响结果表明,随温度升高,作物叶片延伸速率先上升,在27℃左右达最大值而后迅速下降;且在不同土壤水势条件下叶片延伸速率随温度变化的幅度不同,随土壤水势的降低其叶片延伸速率也降低,且叶片延伸速率与土壤水势的变化呈线性关系。土壤水势、温度的变化引起膨压(Ψ_P)的变化,而膨压的变化又引起叶片延伸速率的变化。总趋势是随膨压的增加其叶片延伸速率也增大,且温度与土壤水势共同胁迫对玉米叶片延伸速率影响最大。

Under the condition of Laboratory, we study the effects of water status and temperature on leaf growth of wheat and maize through the determination of leaf extension rate, s and L . The results shows with the increase of temperature,leaf extension rate increases first,arrives at highest value at 27℃ and then decreases rapidly. Under different soil statuses, there are lineral correlations between leaf extension rate and water stress. The changes of soil stress and temperature bring out the changes of p ,and osmotic potential also causes the change of leaf extension rate. As the increase of p ,leaf extension rate increases and at the same time the co-effects of water stress and temperature on leaf extension rate of maize is biggest.