Potential roles of stigma exsertion on spikelet fertility in rice (Oryza sativa L.) under heat stress

Qi, Bo; Wu, Chao

doi:10.3389/fpls.2022.983070

Cited by 9 publications

(5 citation statements)

References 80 publications

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“…Further studies are required to clarify their genetic interaction in SER regulation. In addition, it is worth noting that stigma viability is also an important factor for the success of out‐crossing seed setting (Qi and Wu, 2022 ). However, whether GS3 , GW8 and GS9 affect stigma vitality also awaits detailed evaluation in future studies.…”

Section: Discussionmentioning

confidence: 99%

Targeted manipulation of grain shape genes effectively improves outcrossing rate and hybrid seed production in rice

Zhu

Gou

Heng

et al. 2022

Plant Biotechnology Journal

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Summary Stigma exsertion rate (SER) of the male sterile line is a key limiting factor for hybrid seed production in rice. Although a large number of quantitative trait loci associated with SER have been reported, few genes have been molecularly cloned and functionally characterized, severely hindering the genetic improvement of SER of the male sterile line and the breeding efficiency of hybrid rice. In this study, we identified three grain shape regulatory genes, GS3, GW8 and GS9, as potential candidate genes for targeted manipulation of grain shape and SER. We show that simultaneously knocking out these three genes could effectively increase SER by increasing the ratio of spikelet length/spikelet width and length of stigma and style, without negative impacts on other agronomic traits. Cellular examination and transcriptomic analyses revealed a role of these genes in coordinated regulation of transverse and longitudinal cell division in the pistils. Moreover, we demonstrate that targeted manipulation of these grain shape genes could significantly improve the outcrossing rate in both the ZH11 (a japonica variety) and Zhu6S (an indica male sterile line) backgrounds. Our results provide new insights into the mechanisms of rice SER regulation and develop an effective strategy to improve SER and out‐crossing rate in rice, thus facilitating hybrid rice production.

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Section: Discussionmentioning

confidence: 99%

Targeted manipulation of grain shape genes effectively improves outcrossing rate and hybrid seed production in rice

Zhu

Gou

Heng

et al. 2022

Plant Biotechnology Journal

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“…All physiological processes of wheat and rice plants are sensitive to temperature and can suffer permanent damage from heat. Heat stress during anthesis can increase floret abortion, and temperatures over 30°C during floret formation may lead to complete sterility [45,46]. Heat stress during the reproductive stage can result in pollen sterility, tissue dehydration, lower CO2 assimilation, increased photorespiration, and reduced resource capture due to accelerated growth and senescence, consequently reducing yield [47,43].…”

Section: Discussionmentioning

confidence: 99%

Influence of Elevated CO2 and Temperature on Yield Attributes of Rice and Wheat in Central India

Parmar,

Gupta,

Kollah

et al. 2024

J. Exp. Agric. Int.

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Elevated CO2 and rising temperature are the major climate changing drivers to attain sustainability in agriculture. The current experiment was carried out to evaluate the extent of impact of climate changing factors on rice and wheat crop. Field experiment was carried out under a Free Air CO2 Enrichment (FACE) condition. The treatments consisted of ambient CO2 and temperature, elevated CO2 of 600ppm + ambient temperature, ambient CO2 + elevated temperature (+2°C), ambient CO2+elevated temperature (+3°C), elevated CO2 of 600 ppm + elevated temperature (+2°C) and elevated CO2 600ppm + elevated temperature (+3°C). The plant yield attributes were biomass, tillers per plant, productive tillers per plant, failure tillers per plant, total number of grains per panicle, failure grains per panicle and test weight. Elevated CO2 stimulated biomass and other yield attributes in both crops. However, elevated temperature inhibited yield attributes. Elevated CO2 enhanced biomass but elevated temperature reduced biomass of crops. Elevated CO2 influenced tillers per plant in rice by -26.9% to 16.6% and in wheat by 3.7% to 25.9%. Elevated temperature affected number tillers up to 26.9%. Number of productive tillers in rice ranged from -28.5% to 21.4% and in wheat by -29.1% to 36%. In wheat the number of grains per panicle varied from -24.3% to 6%. Test weight of grains varied from -9.1% to 4.6% in rice. Combined effect of elevated CO2 and elevated temperature had differential effect on crops. Study highlights that yield attributes and productivity of rice and wheat crop will be affected under elevated CO2 and rising temperature in central part of India and warrants necessary interventions to alleviate climate stress.

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“…Polygenes are controlled stigma excretion in the rice genotype. Recently, part of linked QTLs were identified in relation to stigma excretion, some of these were used in QTL pyramiding to improve the hybrid rice seed production [ 67 – 69 ]. Tian et al, [ 18 ] reported that the excreted stigma considers the main factor affecting outcrossing rate during seed production in hybrid rice (in the female parent spikelet).…”

Section: Discussionmentioning

confidence: 99%

Impacts of kinetin implementation on leaves, floral and root-related traits during seed production in hybrid rice under water deficiency

Ghazy,

Hamad,

Gewaily

et al. 2023

BMC Plant Biol

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Background Water deficit is one of the most significant abiotic factors affecting rice and agricultural production worldwide. In hybrid rice, cytoplasmic male sterility (CMS) is an important technique for creating high-yielding crop based on heterosis. The phytohormone kinetin (Kin) regulates cell division in plant during the early stages of grain formation, as well as flow assimilation and osmotic regulation under water stress. The present study performed to estimate the effects of irrigation intervals (irrigation each six days (I6), nine days (I9), twelve days (I12) and fifteen days (I15) against continuous flooding (CF, each three days)) and kinetin exogenously application (control, 15 mg L−1 and 30 mg L−1) on hybrid rice (L1, IR69625A; L2, G46A and R, Giza 178 R) seed production. Results Leaves traits (Chlorophyll content (CHC), relative water content (RWC), stomatal conductance (SC), Leaf temperature (LT) and transpiration rate (TR)), floral traits such as style length (SL) and total stigma length (TSL), in addition to root traits (i.e., root length (RL), root volume (RV), root: shoot ratio (RSR), root thickness (RT), root xylem vessels number (RXVN) and root xylem vessel area (RXVA) were evaluated and a significant enhancement in most traits was observed. Applying 30 mg L−1 kinetin significantly and positively enhanced all growth, floral and roots traits (RV and RXVA recorded the most increased values by 14.8% and 23.9%, respectively) under prolonging irrigation intervals, in comparison to non-treated plants. Conclusions Subsequently, spraying kinetin exogenously on foliar could be an alternative method to reduce the harmful influences of water deficiency during seed production in hybrid rice.

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Potential roles of stigma exsertion on spikelet fertility in rice (Oryza sativa L.) under heat stress

Cited by 9 publications

References 80 publications

Targeted manipulation of grain shape genes effectively improves outcrossing rate and hybrid seed production in rice

Targeted manipulation of grain shape genes effectively improves outcrossing rate and hybrid seed production in rice

Influence of Elevated CO2 and Temperature on Yield Attributes of Rice and Wheat in Central India

Impacts of kinetin implementation on leaves, floral and root-related traits during seed production in hybrid rice under water deficiency

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