Seasonal decline in leaf photosynthesis in perennial switchgrass explained by sink limitations and water deficit.

ABSTRACT: Leaf photosynthesis of perennial grasses usually decreases markedly from early to late summer, even when the canopy remains green and environmental conditions are favorable for photosynthesis. Understanding the physiological basis of this photosynthetic decline reveals the potential for yield improvement. We tested the association of seasonal photosynthetic decline in switchgrass (Panicum virgatum L.) with water availability by comparing plants experiencing ambient rainfall with plants in a rainfall exclusion experiment in Michigan, USA. For switchgrass exposed to ambient rainfall, daily net CO₂ assimilation ( Anet' ) declined from 0.9 mol CO₂ m^-2 day^-1 in early summer to 0.43 mol CO₂ m^-2 day^-1 in late summ

SUBMITTER: Tejera-Nieves M 

PROVIDER: S-EPMC9846045 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature