Dissection of environmental and physiological effects on the temperature difference between superior and inferior spikelets within a rice panicle

Li, Yi; Zhou, Qianlan; He, Mingjie; Xu, Hongfa; Li, Ganghua; Paul, Matthew J.; Liu, Zhenghui

doi:10.1016/j.cj.2020.10.016

Cited by 6 publications

(5 citation statements)

References 32 publications

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“…Generally speaking, superior grains in the middle and upper positions on the panicle have an advantage over inferior grains at lower positions during grain filling ( Yang, 2010 ). Compared with superior grains, the grain filling process in inferior grains in the lower part of the panicle affects grain yield and quality more significantly ( Cao et al, 2016 ; Li et al, 2021 ). The asynchronous filling of the superior and inferior grains on the panicle may be closely related to sucrose transformation and starch synthesis ( Zhao et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Functional Analysis of OsCIPK17 in Rice Grain Filling

et al. 2022

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We used mutant cipk17 and Nipponbare in field experiments to analyze agronomic traits, photosynthetic parameters, transcriptome, and gene expression. The results demonstrated cytoplasmic localization of OsCIPK17, while GUS allogeneic (A. thaliana) tissue-staining and quantitative analysis showed the gene was expressed in many organs, including flower buds; furthermore, it was involved in root, stem, and leaf growth. Compared to Nipponbare plants, grain filling rate and final grain weight decreased in plants of the knockout mutant owing to a delay in attainment of maximum grain filling rate. Photosystem II (PSII) efficiency was also reduced. Enrichment analysis showed that the functions of differentially expressed genes (DEGs) focused on nucleoside-, nucleotide-, and lipid-binding, as well as hydrolase, transferase, and phosphorylase activities. Signaling pathways mainly included starch and sucrose metabolism, as well as photosynthesis. Additionally, some DEGs were verified by fluorescence analysis. The results showed that knockout of OsCIPK17 affected photosynthesis and starch-, sucrose-, and amino acid metabolism-related gene expression; furthermore, the mutation reduced PSII utilization efficiency, it blocked the synthesis and metabolism of starch and sucrose, and affected the formation and transport of assimilates, thereby reducing final grain weight.

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Section: Introductionmentioning

confidence: 99%

Functional Analysis of OsCIPK17 in Rice Grain Filling

et al. 2022

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“…Stomata are present on the panicle rachides and internal surface of glumes, with a few distributed on the outer surface of glumes (Li et al., 2021; Simkin et al., 2020). The number of stomata on the panicle rachides and the internal surface of glumes was approximately 50 and 5% of that found on leaves, respectively (Li et al., 2021). Therefore, it is not surprising that g s,panicle was much lower than g s,leaf in the present study (Tables 2 and 3).…”

Section: Discussionmentioning

confidence: 99%

“…However, whether panicle photosynthesis is limited by panicle stomatal conductance ( g s,panicle ) and whether g s,panicle is linked to panicle hydraulic conductance ( K panicle ) remain unknown. In fact, stomata have been detected in non‐foliar tissues, including rice panicles (Li et al., 2021; Ranjan et al., 2012), allowing for atmospheric CO 2 assimilation and stomatal transpiration in these tissues (Simkin et al., 2020). Therefore, we hypothesized that the net photosynthetic rate in panicles ( A panicle ) is associated with g s,panicle , which is in turn related to K panicle for achieving the balance between panicle water loss and supply.…”

Section: Introductionmentioning

confidence: 99%

Limiting factors for panicle photosynthesis at the anthesis and grain filling stages in rice (Oryza sativa L.)

et al. 2021

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SUMMARY Panicle photosynthesis is crucial for grain yield in cereal crops; however, the limiting factors for panicle photosynthesis are poorly understood, greatly impeding improvement in this trait. In the present study, pot experiments were conducted to investigate the limiting factors for panicle photosynthesis at the anthesis stage in seven rice genotypes and to examine the temporal variations in photosynthesis during the grain filling stage in the Liangyou 287 genotype. At the anthesis stage, leaf and panicle photosynthesis was positively correlated with stomatal conductance and maximum carboxylation rate, which were in turn associated with hydraulic conductance and nitrogen content, respectively. Panicle hydraulic conductance was positively correlated with the area of bundle sheaths in the panicle neck. During grain filling, leaf and panicle photosynthesis remained constant at the early stage but dramatically decreased from 8 to 9 days after anthesis. The trends of variations in panicle photosynthesis were consistent with those in stomatal conductance but not with those in maximum carboxylation rate. At first, the maximum carboxylation rate and respiration rate in the panicle increased, through elevated panicle nitrogen content, but then drastically decreased, as a result of dehydration. The present study systematically investigated the limiting factors for panicle photosynthesis, which are vital for improving photosynthesis and crop yield.

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“…For some nonleaf tissues, such as tomato fruit, the lack of stomata highlights the sole reliance upon carbon refixation (Simkin et al ., 2020). Stomata are found in various numbers on nonfoliar tissues, such as rice panicles (Li et al ., 2021; Rangan et al ., 2022), wheat stems and ear components (Fig. 3; Hu et al ., 2019; Henry et al ., 2020; Simkin et al ., 2020), and certain fruits (Brazel & Ó'Maoiléidigh, 2019); however, their functionality, including their contribution to carbon acquisition, has not been fully evaluated (Simkin et al ., 2020).…”

Section: Role Of Stomata In Nonfoliar Tissuementioning

confidence: 99%

Photosynthesis – beyond the leaf

Lawson

Milliken

2023

New Phytologist

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Although leaves are considered the main site for photosynthesis, other green nonfoliar tissues can carry out considerable amounts of photosynthetic carbon assimilation. With photosynthesis, a potential target for improving crop productivity, physiology and contribution of nonfoliar tissues to overall plant carbon acquisition is gaining increasing attention. This review will provide an overview of nonfoliar photosynthesis, the role of stomata in these tissues and methodologies for quantification and the contribution to overall carbon gain.

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Dissection of environmental and physiological effects on the temperature difference between superior and inferior spikelets within a rice panicle

Cited by 6 publications

References 32 publications

Functional Analysis of OsCIPK17 in Rice Grain Filling

Functional Analysis of OsCIPK17 in Rice Grain Filling

Limiting factors for panicle photosynthesis at the anthesis and grain filling stages in rice (Oryza sativa L.)

Photosynthesis – beyond the leaf

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