Heat stress during flowering in cereals – effects and adaptation strategies

Jagadish, S. V. Krishna

doi:10.1111/nph.16429

Cited by 134 publications

(103 citation statements)

References 47 publications

(81 reference statements)

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“…Most previous studies investigated damage induced by HT during the owering stage [2,13,14,[28][29][30], and there have been few investigations of the effects of HT during panicle initiation on rice yield formation [2,3]. Therefore, in this study, we assessed the detrimental effects of HT during panicle initiation in rice.…”

Section: Discussionmentioning

confidence: 99%

Abnormal Anther Development Leads to Lower Spikelet Fertility in Rice (Oryza Sativa L.) Under High Temperature During the Panicle Initiation Stage

Cui

Wang

et al. 2020

Preprint

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Background: Decreased spikelet fertility is often responsible for reduction in grain yield in rice (Oryza sativa L.). In this study, two varieties with different levels of heat tolerance, Liangyoupeijiu (LYPJ, heat susceptible) and Shanyou63 (SY63, heat tolerant) were subjected to two temperature treatments for 28 days during the panicle initiation stage in temperature/relative humidity-controlled greenhouses: high temperature (HT; 37/27℃; day/night) and control temperature (CK; 31/27℃; day/night) to investigate changes in anther development under HT during panicle initiation and their relationship with spikelet fertility.Results: HT significantly decreased the grain yield of LYPJ by decreasing the number of spikelets per panicle and seed setting percentage. In addition, HT produced minor adverse effects in SY63. The decreased spikelet fertility was primarily attributed to decreased pollen viability and anther dehiscence, as well as poor pollen shedding of the anthers of LYPJ under HT. HT resulted in abnormal anther development (fewer vacuolated microspores, un-degraded tapetum, unevenly distributed Ubisch bodies) and malformation of pollen (obscure outline of the pollen exine with a collapsed bacula, disordered tectum, and no nexine of the pollen walls, uneven sporopollenin deposition on the surface of pollen grains) in LYPJ, which may have lowered pollen viability. Additionally, HT produced a compact knitted anther cuticle structure of the epidermis, an un-degraded septum, a thickened anther wall, unevenly distributed Ubisch bodies, and inhibition of the confluent locule, and these malformed structures may be partially responsible for the decreased anther dehiscence rate and reduced pollen shedding of the anthers in LYPJ. In contrast, the anther wall and pollen development of SY63 were not substantially changed under HT. Conclusions: Our results suggest that disturbed anther walls and pollen development are responsible for the reduced spikelet fertility and grain yield of the tested heat susceptible variety, and noninvasive anthers and pollen formation in response to HT were associated with improved heat tolerance.

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Section: Discussionmentioning

confidence: 99%

Abnormal Anther Development Leads to Lower Spikelet Fertility in Rice (Oryza Sativa L.) Under High Temperature During the Panicle Initiation Stage

Cui

Wang

et al. 2020

Preprint

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“…During flowering, pollen viability, fertilization and embryo development are sensitive to heat beyond a certain temperature threshold (Jagadish, 2020;Prasad et al, 2017;Rieu et al, 2017) TA B L E 1 0 Saturated seed fatty acid composition under control and HDT treatments under field conditions a significant linear reduction in both traits in all 12 canola cultivars.…”

Section: Hdt and Hdnt Negatively Affects Reproductive Organs Silique Number And Yieldmentioning

confidence: 99%

Heat stress affects floral morphology, silique set and seed quality in chamber and field grown winter canola

Pokharel

Stamm

Hein

et al. 2021

J Agronomy Crop Science

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Canola (Brassica napus L.), also known as oilseed rape or double-low rapeseed, is currently one of the most productive and important oilseed crops grown worldwide (Zhang & Flottmann, 2016). The increasing threat of climate change is already having a substantial impact on agricultural production worldwide, as heat waves can cause significant yield losses (Gornall et al., 2010). Over the past century, global mean air temperature has increased by 0.5°C which is predicted to further increase by 1.5-4.5°C by 2100 (IPCC, 2014). Further, the daily minimum temperature is reported to be rapidly increasing at twice the rate of the daily maximum tempera-

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“…Since daily temperature generally peaks at noon, which overlaps with the flowering time in some crops, one of the countermeasures is an effective heat escape mechanism (Jagadish, 2020). Therefore, naturally or genetically introducing flowering traits towards cooler times of day can potentially minimize heat stress damage on reproductive organs.…”

Section: Bioengineering Crops For High Temperature Tolerancementioning

confidence: 99%

“…Some dryland crops are able to optimize their anthesis during morning or cooler evening periods under heat stress (Aiqing et al, 2018;Bheemanahalli et al, 2019). In contrast, most rice varieties need the genetic introduction of early morning flowering trait to shift their flower opening time (Bheemanahalli et al, 2017;Jagadish, 2020).…”

Section: Bioengineering Crops For High Temperature Tolerancementioning

confidence: 99%

The Heat is On: How Crops Respond to High Temperature

Zhu

Lima

Smet

2020

Preprint

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Plants are exposed to a wide range of temperatures during their life cycle and need to continuously adapt. These adaptations need to deal with temperature changes on a daily and seasonal level and with temperatures affected by climate change, and need to take into account that different organs have different optimal temperature ranges. Increasing global temperatures impact crop performance, and several physiological and developmental responses to increased temperature have been described that allow to mitigate this. In this review, we assess various developmental, physiological and biochemical responses of crops to high temperature, focusing on knowledge gained from both monocots (e.g. wheat, barley, maize, rice) and dicots (e.g. soybean or tomato). We outline several outstanding questions where crop research can exploit knowledge from model plants, such as Arabidopsis thaliana, and we highlight that studying molecular mechanisms directly in relevant crops is essential.

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Heat stress during flowering in cereals – effects and adaptation strategies

Cited by 134 publications

References 47 publications

Abnormal Anther Development Leads to Lower Spikelet Fertility in Rice (Oryza Sativa L.) Under High Temperature During the Panicle Initiation Stage

Abnormal Anther Development Leads to Lower Spikelet Fertility in Rice (Oryza Sativa L.) Under High Temperature During the Panicle Initiation Stage

Heat stress affects floral morphology, silique set and seed quality in chamber and field grown winter canola

The Heat is On: How Crops Respond to High Temperature

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