Effect of Alternate Wetting and Drying Irrigation on Post-anthesis Remobilization of Assimilates and Grain Filling of Rice

Xu, Yunji; Xu, Yang-Dong; Li, Yinyin; Qian, Xiaoqing; Wang, Zhiqin

doi:10.3724/sp.j.1006.2018.00554

Cited by 6 publications

(11 citation statements)

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“…Some scholars have found that soil drought after heading causes several NSCs in the rice stem to transfer to the grain. The contribution rate could even reach more than 40% [ 33 ] and some research found that this transport promotion effect would increase with an increase in drought stress intensity [ 14 ]. We found that the NSC content in stems and sheathing of SJ6 under severe drought was higher than that of the moderate treatment during the stress period, while that of DN425 occurred after the restoration of irrigation.…”

Section: Discussionmentioning

confidence: 99%

“…Some scholars have found that mild drought stress increases grain weight, maximum grain-filling rate and mean grain-filling rate of inferior grains, but has no significant effect on superior grains. Severe drought stress significantly decreased in the superior and inferior grains [ 14 ]. In this study, mild drought stress significantly reduced the grain-filling rate and significantly prolonged the grain-filling activity period of the superior and inferior grains in the two varieties.…”

Section: Discussionmentioning

confidence: 99%

“…Xu et al reported that both mild and severe drought stress decreased the efficiency of panicle number. In contrast, mild drought increased grain number per panicle, thousand-grain weight and seed setting rate, while severe drought had the opposite effect [ 14 ]. In this study, panicle length and the number of secondary branches was significantly reduced under drought stress.…”

Section: Discussionmentioning

confidence: 99%

“…Mild alternate wetting–drying at the filling stage was beneficial for transporting NSC in the stem and sheath to grains [ 14 , 15 , 16 ]. The results showed that the transport of photosynthetic assimilates from the source to the sink played an essential role in grain filling.…”

Section: Introductionmentioning

confidence: 99%

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Response of Rice with Overlapping Growth Stages to Water Stress by Assimilates Accumulation and Transport and Starch Synthesis of Superior and Inferior Grains

Wang

Min

et al. 2022

IJMS

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Drought stress at jointing–booting directly affects plant growth and productivity in rice. Limited by natural factors, the jointing and booting stages of short-growth-period rice varieties are highly overlapped in high-latitude areas, which are more sensitive to water deficit. However, little is known about the dry matter translocation in rice and the strategies of starch synthesis and filling of superior and inferior grains under different drought stress was unclear. In this study, the rice plants were subjected to three degrees of drought stress (−10 kPa, −25 kPa, −40 kPa) for 15 days during the jointing–booting stage; we investigated dry matter accumulation and translocation, grain filling and enzyme activities to starch synthesis of superior and inferior grains in rice with overlapping growth stages from 2016 to 2017. The results showed that drought stress significantly reduced dry matter accumulation in the stems and leaves. Mild and moderate drought increased dry matter translocation efficiency. However, severe drought stress largely limited the dry matter accumulation and translocation. A large amount of dry matter remains in vegetative organs under severe drought stress. The high content in NSC in stem and sheath plays a key role in resisting drought stress. The drought stress at jointing–booting directly caused a change in the grain filling strategy. Under moderate and severe drought, the grain-filling active period of the superior grains was shortened to complete the necessary reproductive growth. The grain-filling active period of the inferior grains was significantly prolonged to avoid a decrease in grain yield. The significant decrease in the grain-filling rate of the superior and inferior grains caused a reduction in the thousand-grain weight. In particular, the influence of the grain-filling rate of inferior grains on the thousand-grain weight was more significant. Drought stress changed the starch synthesis strategies of the superior and inferior grains. Soluble starch synthase and starch branching enzyme activities of inferior grains increased significantly under drought stress. GBSS activity was not sensitive to drought stress. Therefore, amylose content was decreased and amylopectin synthesis was enhanced under drought stress, especially in inferior grains.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Response of Rice with Overlapping Growth Stages to Water Stress by Assimilates Accumulation and Transport and Starch Synthesis of Superior and Inferior Grains

Wang

Min

et al. 2022

IJMS

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“…This indicates that the lower grain weight of the osled plants was largely attributed to the shortage of carbohydrates supply, rather than sink (grain) capacity limitation itself. The grain weight is the product of photosynthetic accumulation and pre‐anthesis NSC transportation from stems during the grain‐filling period of rice (Fu, Huang, Wang, Yang, & Zhang, 2011; Xu et al., 2018). It can be speculated that the gene of OsLED may participate in the regulation of grain filling in rice.…”

Section: Discussionmentioning

confidence: 99%

Agronomic and physiological characteristics of a rice leaf early senescence mutant during its whole growth period

Shen

et al. 2020

Crop Science

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Diverse rice (Oryza sativa L.) leaf early senescence mutants have been identified and used for studies on senescence mechanisms. However, the reports are few about the agronomic and physiological characteristics of rice leaf early senescence mutants during the whole growth period. This study used a rice leaf early senescence mutant (osled) and its wild type (WT) to compare their main phenotypic and agronomic traits at different growth stages, as well as some physiological characteristics. The results showed the osled plants exhibited leaf early senescence initiating from the middle seedling stage to maturation, accompanied with dwarf phenotype, prolonged vegetative growth period, decreased green leaf area, reduced aboveground biomass, decreased crop growth rate and net assimilation rate, smaller panicle, an awn of 1.56‐ to 1.58‐cm length, and more panicles. Compared with WT, the osled plants had significantly reduced chlorophyll content, photosynthetic capacity, N content, and activities of nitrate reductase and glutamine synthase in leaves and enhanced activity of glutamate synthase and lowered pre‐anthesis nonstructural carbohydrate accumulation and remobilization in stems. The study revealed some physiological mechanisms underlying leaf senescence of the osled and provided new perspectives for understanding the growth characteristics of rice leaf early senescence mutants.

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Alternate wetting and moderate soil drying could increase grain yields in both main and ratoon rice crops

Zhang

Liu

et al. 2022

Crop Science

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Alternate wetting and drying irrigation is a widely used irrigation method for water‐savings and high‐yielding in rice (Oryza sativa L.) production; however, its effect on grain yield (GY) in the main and ratoon crops is unclear. With two rice cultivars as materials, the effects on GY in the main and ratoon crop of three irrigation regimes, that is, conventional flooding irrigation (CI), alternate wetting and moderate soil drying irrigation (WMD), and alternate wetting and severe soil drying irrigation (WSD), during grain filling of the main crop were investigated. Compared with CI, WMD increased GY by 6.0∼6.5% in the main crop by increasing the 1,000‐grain weight and filled grain rate, whereas the ratoon crop GY increased by 13.3∼14.6% via increased panicle number. The WSD had no significant effects on the main crop GY, but significantly decreased ratoon crop GY by decreasing panicle number. A higher leaf photosynthetic rate, leaf area index, root oxidation activity, dry matter accumulation and nonstructural carbohydrate (NSC) translocation under WMD primarily drove the increased 1,000‐grain weight and filled grain rate in the main crop. Under WMD, higher soluble sugar contents catalysed by high amylase activity and higher zeatin + zeatin riboside in stems of the main crop promoted the growth of regenerated buds and increased the ratoon crop panicle number. In conclusion, WMD during grain filling of the main crop improved the growth and development of the main crop and promote the germination of regenerated buds, thereby increasing the GY of both main and ratoon crops.

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Effect of Alternate Wetting and Drying Irrigation on Post-anthesis Remobilization of Assimilates and Grain Filling of Rice

Cited by 6 publications

References 0 publications

Response of Rice with Overlapping Growth Stages to Water Stress by Assimilates Accumulation and Transport and Starch Synthesis of Superior and Inferior Grains

Response of Rice with Overlapping Growth Stages to Water Stress by Assimilates Accumulation and Transport and Starch Synthesis of Superior and Inferior Grains

Agronomic and physiological characteristics of a rice leaf early senescence mutant during its whole growth period

Alternate wetting and moderate soil drying could increase grain yields in both main and ratoon rice crops

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