甘蔗品种在水分亏缺条件下的生理参数

J. P. Graça, F. A. Rodrigues, J. Farias, M. C. Oliveira, C. B. Hoffmann-Campo, S. Zingaretti
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引用次数: 96

摘要

为了研究甘蔗植株对水分亏缺的敏感性过程,研究了耐旱品种SP83-2847和CTC15和敏感品种SP86-155的生理参数。水分亏缺在品种内和品种间以不同方式影响所有植物的光合器官。水分亏缺的品种光合速率和气孔导度均显著降低。抗性品种SP83-2847和CTC15的对照植株光合速率高于敏感品种SP86-155。CTC15在干旱期相对含水量最高。SP83-2847的量子效率光系统II在试验处理的最后几天更为稳定,表明相对含水量的下降刺激了光合能力的调整,以适应水分有效性的变化。总体而言,耐蚀品种SP83-2847和CTC15的光合性能优于敏感品种SP86-155。这些生理参数可用于甘蔗耐旱和敏感基因型的评价和区分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Physiological parameters in sugarcane cultivars submitted to water deficit
To investigate the processes involved in the susceptibility of sugarcane plants to water deficit, several physiological parameters were evaluated in drought tolerant (SP83-2847 and CTC15) and sensitive (SP86-155) cultivars. The water deficit affected the photosynthetic apparatus of all the plants in different ways, within and among cultivars. The photosynthetic rate and stomatal conductance decreased significantly in all cultivars submitted to water deficit. In control plants of the tolerant cultivars (SP83-2847 and CTC15) the photosynthetic rate was higher than in the sensitive cultivar (SP86-155). Cultivar CTC15 showed the highest relative water content during the dry period. The quantum efficiency photosystem II of cultivar SP83-2847 was more stable in the last days of the experimental treatment, suggesting that the decline in relative water content stimulated an adjustment of photosynthetic capacity to tolerate the changes in water availability. As a whole, the tolerant SP83-2847 and CTC15 cultivars exhibited a better photosynthetic performance than the sensitive SP86-155 cultivar. The data suggest that these physiological parameters can be used in the evaluation and distinction of drought tolerant and sensitive sugarcane genotypes.
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