Advances on the Study of Diurnal Flower-Opening Times of Rice

Wang, Mumei; Chen, Minghao; Huang, Zhen; Zhou, Hai; Liu, Zhenlan

doi:10.3390/ijms241310654

Cited by 5 publications

(1 citation statement)

References 69 publications

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“…In indica rice varieties diurnal flower opening time, otherwise known as floret-opening time begin around 10 am (Wang et al, 2022;Wang et al, 2023). We reported that heat tolerant varieties grown under LHS maintained lower canopy temperature−not just during the crucial daytime flowering period of 10 am to 12 pm, but throughout the entire day and night−compared to heat susceptible varieties grown under the same scenario.…”

Section: Discussionmentioning

confidence: 94%

Micrometeorological monitoring reveals that canopy temperature is a reliable trait for the screening of heat tolerance in rice

Tian,

Mu,

Gao

et al. 2024

Front. Plant Sci.

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Micrometeorological monitoring is not just an effective method of determining the impact of heat stress on rice, but also a reliable way of understanding how to screen for heat tolerance in rice. The aim of this study was to use micrometeorological monitoring to determine varietal differences in rice plants grown under two weather scenarios−Long-term Heat Scenario (LHS) and Normal Weather Scenario (NWS)− so as to establish reliable methods for heat tolerance screening. Experiments were conducted with two heat susceptible varieties−Mianhui 101 and IR64−and two heat tolerant varieties, Quanliangyou 681 and SDWG005. We used staggered sowing method to ensure that all varieties flower at the same time. Our results showed that heat tolerant varieties maintained lower canopy temperature compared to heat susceptible varieties, not just during the crucial flowering period of 10 am to 12 pm, but throughout the entire day and night. The higher stomatal conductance rate observed in heat tolerant varieties possibly decreased their canopy temperatures through the process of evaporative cooling during transpiration. Conversely, we found that panicle temperature cannot be used to screen for heat tolerance at night, as we observed no significant difference in the panicle temperature of heat tolerant and heat susceptible varieties at night. However, we also reported that higher panicle temperature in heat susceptible varieties decreased spikelet fertility rate, while low panicle temperature in heat tolerant varieties increased spikelet fertility rate. In conclusion, the results of this study showed that canopy temperature is probably the most reliable trait to screen for heat tolerance in rice.

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Section: Discussionmentioning

confidence: 94%

Micrometeorological monitoring reveals that canopy temperature is a reliable trait for the screening of heat tolerance in rice

Tian,

Mu,

Gao

et al. 2024

Front. Plant Sci.

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A systematic review on the implications of concurrent heat and drought stress in modulating floral development in plants

Kumari,

Basu,

Kumar

2024

Plant Science

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Controlling diurnal flower‐opening time by manipulating the jasmonate pathway accelerates development of indica–japonica hybrid rice breeding

Wang,

Zhu,

Huang

et al. 2024

Plant Biotechnology Journal

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SummaryInter‐subspecific indica–japonica hybrid rice (Oryza sativa) has the potential for increased yields over traditional indica intra‐subspecies hybrid rice, but limited yield of F1 hybrid seed production (FHSP) hinders the development of indica–japonica hybrid rice breeding. Diurnal flower‐opening time (DFOT) divergence between indica and japonica rice has been a major contributing factor to this issue, but few DFOT genes have been cloned. Here, we found that manipulating the expression of jasmonate (JA) pathway genes can effectively modulate DFOT to improve the yield of FHSP in rice. Treating japonica cultivar Zhonghua 11 (ZH11) with methyl jasmonate (MeJA) substantially advanced DFOT. Furthermore, overexpressing the JA biosynthesis gene OPDA REDUCTASE 7 (OsOPR7) and knocking out the JA inactivation gene CHILLING TOLERANCE 1 (OsHAN1) in ZH11 advanced DFOT by 1‐ and 2‐h respectively; and knockout of the JA signal suppressor genes JASMONATE ZIM‐DOMAIN PROTEIN 7 (OsJAZ7) and OsJAZ9 resulted in 50‐min and 1.5‐h earlier DFOT respectively. The yields of FHSP using japonica male‐sterile lines GAZS with manipulated JA pathway genes were significantly higher than that of GAZS wildtype. Transcriptome analysis, cytological observations, measurements of elastic modulus and determination of cell wall components indicated that the JA pathway could affect the loosening of the lodicule cell walls by regulating their composition through controlling sugar metabolism, which in turn influences DFOT. This research has vital implications for breeding japonica rice cultivars with early DFOT to facilitate indica–japonica hybrid rice breeding.

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Advances on the Study of Diurnal Flower-Opening Times of Rice

Cited by 5 publications

References 69 publications

Micrometeorological monitoring reveals that canopy temperature is a reliable trait for the screening of heat tolerance in rice

Micrometeorological monitoring reveals that canopy temperature is a reliable trait for the screening of heat tolerance in rice

A systematic review on the implications of concurrent heat and drought stress in modulating floral development in plants

Controlling diurnal flower‐opening time by manipulating the jasmonate pathway accelerates development of indica–japonica hybrid rice breeding

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