New Approaches Combined with Environmental Control for Enhancing Heat-Tolerant Rice Breeding in Japan

Wada, Hiroshi

doi:10.1007/978-981-13-9235-1_3

Adaptation to Climate Change in Agriculture 2019

DOI: 10.1007/978-981-13-9235-1_3

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New Approaches Combined with Environmental Control for Enhancing Heat-Tolerant Rice Breeding in Japan

Hiroshi Wada

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Cited by 3 publications

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“…A decline in population of healthy pollen grains has gained attention as a cause of spikelet sterility 5 , as well as anther indehiscence 4,6 . Although multiple quantitative trait loci (QTL) have been identified for heat tolerance at flowering 7 , information is still limited and no superior heat-tolerant cultivars at flowering have been developed, at least in Japan 8 . For reasons of convenience and rapidness, in vitro pollen viability has been widely determined by using iodine staining for screening in rice breeding; however, this method has been recently called into question 1 .…”

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On-site single pollen metabolomics reveals varietal differences in phosphatidylinositol synthesis under heat stress conditions in rice

Wada

Hatakeyama

Nakashima

et al. 2020

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Although a loss of healthy pollen grains induced by metabolic heat responses has been indicated to be a major cause of heat-induced spikelet sterility under global climate change, to date detailed information at pollen level has been lacking due to the technical limitations. In this study, we used picolitre pressure-probe-electrospray-ionization mass spectrometry (picoPPESI-MS) to directly determine the metabolites in heat-treated single mature pollen grains in two cultivars, heat-tolerant cultivar, N22 and heat-sensitive cultivar, Koshihikari. Heat-induced spikelet fertility in N22 and Koshihikari was 90.0% and 46.8%, respectively. While no treatment difference in in vitro pollen viability was observed in each cultivar, contrasting varietal differences in phosphatidylinositol (PI)(34:3) have been detected in mature pollen, together with other 106 metabolites. Greater PI content was detected in N22 pollen regardless of the treatment, but not for Koshihikari pollen. In contrast, there was little detection for phosphoinositide in the single mature pollen grains in both cultivars. Our findings indicate that picoPPESI-MS analysis can efficiently identify the metabolites in intact single pollen. Since PI is a precursor of phosphoinositide that induces multiple signaling for pollen germination and tube growth, the active synthesis of PI(34:3) prior to germination may be closely associated with sustaining spikelet fertility even at high temperatures.

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confidence: 99%

On-site single pollen metabolomics reveals varietal differences in phosphatidylinositol synthesis under heat stress conditions in rice

Wada

Hatakeyama

Nakashima

et al. 2020

Sci Rep

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Breeding priorities for rice adaptation to climate change in Northeast China

et al. 2023

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Breeding is an important adaptation strategy to sustain rice production in China.However, the breeding priorities for ideal adaptation to future climate stress remain unknown. Here, we established 15 scenarios representing the use of varieties with high-median-low levels of chilling sensitivity, heat sensitivity, and maturity-type properties based on 140 existing rice varieties, and assessed the effectiveness of these scenarios for climate change adaptation in Northeast China. Results showed that the average yield of low-chilling-sensitivity varieties will decline by 10.8-47.5% in the 2100s, depending on shared socioeconomic pathways (SSPs). If the increase in warming is greater than 1.7°C, low-heat-sensitivity varieties show higher yields than low-chilling-sensitivity ones, but the average yield will decline by 10.4-33.5% in the 2100s than that under baseline climate. Comparably, the contribution of varieties with an extended whole growth duration was at least 5 times greater than that of lowsensitivity varieties, resulting in a 50% yield increase relative to that at the baseline climate. Our study suggests that late-maturing varieties have considerable breeding potential relative to the varieties with low sensitivity to cold and heat stresses, and late maturity is thus recommended as the primary breeding target for adaptation to climate change in Northeast China.

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Endosperm cell size reduction caused by osmotic adjustment during nighttime warming in rice

Wada

Chang

Hatakeyama

et al. 2021

Sci Rep

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High night temperature (HNT) often reduces yield in field crops. In rice, HNT during the ripening stage diminishes endosperm cell size, resulting in a considerable reduction in final kernel weight; however, little is known about the underlying mechanisms at cell level. In this study, we performed picolitre pressure-probe-electrospray-ionization mass spectrometry to directly determine metabolites in growing inner endosperm cells of intact seeds produced under HNT conditions, combining with 13C feeding and water status measurements including in situ turgor assay. Microscopic observation in the inner zone suggested that approximately 24.2% of decrease in cell expansion rate occurred under HNT at early ripening stage, leading to a reduction in cell volume. It has been shown that HNT-treated plants were subjected to mild shoot water deficit at night and endosperm cell turgor was sustained by a decline in osmotic potential. Cell metabolomics also suggests that active solute accumulation was caused by a partial inhibition of wall and starch biosynthesis under HNT conditions. Because metabolites were detected in the single cells, it is concluded that a partial arrest of cell expansion observed in the inner endosperms was caused by osmotic adjustment at mild water deficit during HNT conditions.

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New Approaches Combined with Environmental Control for Enhancing Heat-Tolerant Rice Breeding in Japan

Cited by 3 publications

References 40 publications

On-site single pollen metabolomics reveals varietal differences in phosphatidylinositol synthesis under heat stress conditions in rice

On-site single pollen metabolomics reveals varietal differences in phosphatidylinositol synthesis under heat stress conditions in rice

Breeding priorities for rice adaptation to climate change in Northeast China

Endosperm cell size reduction caused by osmotic adjustment during nighttime warming in rice

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