南亚热带四种不同演化程度禾本科植物夏季光能利用策略差异分析

Subjects: Biology >> Botany >> Applied botany submitted time 2021-04-13 Cooperative journals: 《广西植物》

张雅芳 王海玲 朱师丹 张小燕 朱俊杰

Abstract： In order to explore the light energy utilization strategy of four Poaceae species， including sugarcane, carpet grass, bulrush and buddha bamboo, the plants in the field or original habitat were used as materials. We determined the chlorophyll fluorescence and photosynthetic gas exchange characteristics from freshly cut seedlings leaves in vivo, and then sampled the leaves to analyze the pigment contents during the hottest period of the summer. The results were as follows: (1) The C4 sugarcane and carpet grass had high net photosynthetic rate (Pn) coupled with high water use efficiency (WUE) and high quantum-yield efficiency (Φi), thus being able to assimilate a large fraction of light energy; (2) The C3 bulrush had relatively high Pn, WUE and Φi, its high carotenoid pool which coupled high heat dissipation (NPQ) may help the bulrush to get rid of the excessive light energy; (3) The C3 buddha bamboo had the lowest Pn, WUE and Φi, however, its large carotenoid contents and high xanthophyll de-epoxidation level (DPS), coupled with high NPQ are expected to help the leaves to dissipate the excess light energy. The light-use strategies of the four grass species were also affected by their life forms. These findings are expected to help breeding programs for sugarcane, carpet grass and bamboos, and to provide a physiological reference for wetland ecological restoration and planning.

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