Temporal and spatial variations of carbon isotope signature reveal substantial contribution of bracts and internode assimilates to grain filling of japonica rice

Jiang, Mengjiao; Xu, Hongfa; Yang, Nianfu; Li, Ganghua; Paul, Matthew J.; Liu, Zhenghui

doi:10.1016/j.cj.2020.06.011

Cited by 6 publications

(1 citation statement)

References 30 publications

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“…They confirmed the validity of the source manipulation techniques for studying ear photosynthesis in many accessions. Other techniques were proposed for the high throughput phenotyping of photosynthetic organs contributions, such as using the stable carbon isotope (δ 13 C) signatures in the grains dry matter vs. the δ 13 C signatures in other organs (i.e., peduncle, flag, rachis, glumes, and awns), which quantify the different organ photosynthetic contribution to grain filling (Araus et al., 1993; Hafsi et al., 2000; Jia et al., 2015; Jiang et al., 2021; Merah & Monneveux, 2015; Merah et al., 2018; Tambussi et al., 2021). Using the chlorophyll (Chl) fluorescence technique was also proposed to indirectly assess the photosynthetic activity of different plant organs (Lu & Lu, 2004; Maydup et al., 2014).…”

Section: Conclusion and Further Workmentioning

confidence: 99%

Photosynthetic organs contributions to grain yield genetic gains in Chilean winter wheat

2021

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Investigating the key traits associated with genetic gains in grain yield (GY) is essential for developing winter wheat (Triticum aestivum L.) breeding strategies. The study objectives were: (a) quantifying the photosynthetic contribution of flag leaf and ear to the grain filling; (b) analyzing if their contributions are associated with the genetic gains in GY; and (c) analyzing their relationship with other agronomical and physiological traits. Thus, six winter wheat genotypes of different release years were grown under optimal conditions in a greenhouse trial during 2019. Grain yield increased by 126 kg h -1 yr -1 , with the harvest index's change being the key factor affecting these gains. Compared to the control treatment, ear shading decreased ear contribution to grain filling by 16.35%, while both flag leaf and awn removal increased contribution to grain filling by 4.46 and 5.90%, respectively. Ear photosynthetic contribution estimated by source manipulation treatments showed a significant increase with the release year (0.54% yr -1 ). Whole ear gas exchange measures correlated positively with GY, and both dark respiration and gross photosynthesis showed positive correlations with the release year. The main findings of the study were: (a) GY gains in Chile were mainly due to the increased harvest index (HI), while the aerial biomass (AB) did not play a significant role in these gains; (b) the increased ear size besides the terminal heat stress during the study highlighted the ear role as the primary photosynthetic contributor to grain filling; and (c) using source manipulation techniques as an indirect selection trait for high ear photosynthesis appeared to be promising.

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Section: Conclusion and Further Workmentioning

confidence: 99%

Photosynthetic organs contributions to grain yield genetic gains in Chilean winter wheat

2021

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Prolonged drought affects the interaction of carbon and nitrogen metabolism in root and shoot of cotton

et al. 2022

Environmental and Experimental Botany

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A novel light interception trait of a hybrid rice ideotype indicative of leaf to panicle ratio

Xiao

et al. 2021

Field Crops Research

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Temporal and spatial variations of carbon isotope signature reveal substantial contribution of bracts and internode assimilates to grain filling of japonica rice

Cited by 6 publications

References 30 publications

Photosynthetic organs contributions to grain yield genetic gains in Chilean winter wheat

Photosynthetic organs contributions to grain yield genetic gains in Chilean winter wheat

Prolonged drought affects the interaction of carbon and nitrogen metabolism in root and shoot of cotton

A novel light interception trait of a hybrid rice ideotype indicative of leaf to panicle ratio

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