Are plant growth and photosynthesis limited by pre-drought following rewatering in grass?

光合作用 多年生植物 农学 耐旱性 气孔导度 含水量 生物量(生态学) 用水效率 生态系统 光合能力 生物 相对增长率 植物生理学 环境科学 植物 增长率 数学 生态学 岩土工程 几何学 工程类
作者
Zhenzhu Xu,Guangsheng Zhou,Hideyuki Shimizu
出处
期刊:Journal of Experimental Botany [Oxford University Press]
卷期号:60 (13): 3737-3749 被引量:184
标识
DOI:10.1093/jxb/erp216
摘要

Although the relationship between grassland productivity and soil water status has been extensively researched, the responses of plant growth and photosynthetic physiological processes to long-term drought and rewatering are not fully understood. Here, the perennial grass (Leymus chinensis), predominantly distributed in the Euro-Asia steppe, was used as an experimental plant for an irrigation manipulation experiment involving five soil moisture levels [75–80, 60–75, 50–60, 35–50, and 25–35% of soil relative water content (SRWC), i.e. the ratio between present soil moisture and field capacity] to examine the effects of soil drought and rewatering on plant biomass, relative growth rate (RGR), and photosynthetic potential. The recovery of plant biomass following rewatering was lower for the plants that had experienced previous drought compared with the controls; the extent of recovery was proportional to the intensity of soil drought. However, the plant RGR, leaf photosynthesis, and light use potential were markedly stimulated by the previous drought, depending on drought intensity, whereas stomatal conductance (gs) achieved only partial recovery. The results indicated that gs may be responsible for regulating actual photosynthetic efficiency. It is assumed that the new plant growth and photosynthetic potential enhanced by pre-drought following rewatering may try to overcompensate the great loss of the plant's net primary production due to the pre-drought effect. The present results highlight the episodic effects of drought on grass growth and photosynthesis. This study will assist in understanding how degraded ecosystems can potentially cope with climate change.
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