Effects of Low Light Stress on Growth Parameters of Rice (Oryza sativa L.) Genotypes

Dhruw, Aradhana; Guhey, Arti

doi:10.20546/ijcmas.2018.707.057

Cited by 2 publications

(2 citation statements)

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“…However, even though more DM was redistributed from the SPS to the grain under shading stress, it was not sufficient to make up for shading damage, leading to a 6.96%-22.52% reduction in DWG at the maturity stage (Figure 1). These results are consistent with those of previous studies that have reported a decrease in DM production in rice plants and in the proportion of DM allocated to grain caused by shading stress, which led to insufficient grain filling (Wang et al, 2015;Dhruw and Guhey, 2018).…”

Section: Discussionsupporting

confidence: 93%

“…Dry matter accumulation after the heading stage is particularly important for rice yield formation, and it is estimated that approximately 60% of grain assimilates are produced by photosynthesis during this stage (Wu et al, 2018). Under shading stress (or decreased solar radiation), however, plant photosynthesis is inhibited (Dhruw and Guhey, 2018;Chen et al, 2019), resulting in insufficient photosynthate supply from foliage for grain production. Consequently, rice plants show increased remobilization of stored DM from the SPS to the grain as a compensation mechanism (Ren et al, 2003;Deng et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

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Shading stress after heading enhances the remobilization of nonstructural carbohydrates in rice under different ecological conditions

Zeng

et al. 2021

Chil. j. agric. res.

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Low light levels during rice (Oryza sativa L.) growing seasons may lead to significant reductions in grain yield and quality. The effect of shading stress on remobilization of nonstructural carbohydrates (NSC) from the stem plus sheath (SPS) to the grain, a process crucial to rice grain formation, was investigated. Field shading experiments were conducted in Hanyuan and Wenjiang, China, using two rice varieties (Huanghuazhan and Guichao II) subjected to shading stress after heading. Stored NSC of 60.00-159.15 g m -2 were remobilized from SPS after heading, contributing 9.63%-23.63% to grain dry weight at maturity. Shading stress resulted in the 23.99%-50.30% and 31.65%-61.33% reduction in NSC content of SPS at 20 d after heading (DAH20) and maturity stages, respectively. This contributed to the 13.80%-89.00% increase in the remobilization of stored NSC from SPS to the grain (RASN) and 15.86%-73.30% increase in remobilization percentage of removed NSC from SPS to the grain (RPRN). The effect of shading stress on remobilization differed between sites and varieties. Owing to a greater sink capacity, shading stress led to a higher RASN and RPRN from heading to DAH20 for 'Huanghuazhan' in Hanyuan. To compensate for photosynthate deficiency under shading stress, rice is adapted to remobilize stored NSC during early grain filling stages. Consequently, grain yield loss caused by shading could be reduced by increasing the SPS remobilization ability (especially in low light areas). Increasing NSC accumulation in SPS before heading for later remobilization may be a feasible way to alleviate rice yield loss under adverse light conditions.

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Section: Discussionsupporting

confidence: 93%