High temperature stress during flowering and grain filling offsets beneficial impact of elevated CO₂ on assimilate partitioning and sink-strength in rice.

ABSTRACT: Elevated [CO₂] (e[CO₂]) environments have been predicted to improve rice yields under future climate. However, a concomitant rise in temperature could negate e[CO₂] impact on plants, presenting a serious challenge for crop improvement. High temperature (HT) stress tolerant NL-44 and high yielding basmati Pusa 1121 rice cultivars, were exposed to e[CO₂] (from panicle initiation to maturity) and a combination of e[CO₂] + HT (from heading to maturity) using field based open top chambers. Elevated [CO₂] significantly increased photosynthesis, seed-set, panicle weight and grain weight across both cultivars, more prominently with Pusa 1121. Conversely, e[CO₂] + HT during flowering and early grain filling significantly r

SUBMITTER: Chaturvedi AK 

PROVIDER: S-EPMC5557921 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature