The Physiology of Reproductive-Stage Abiotic Stress Tolerance in Cereals

Powell, Nicola; Ji, Xuemei; Ravash, Rudabe; Edlington, Jane; Oliver, Sandra N.; Dongen, Joost T. van; Shiran, Behrouz

doi:10.1007/978-81-322-0807-5_8

Cited by 36 publications

(39 citation statements)

References 141 publications

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“…Even though normal watering resumed after 7 days of water withholding, the stress during meiosis had a significant and irreversible effect on seed set. This result was consistent with previous reports on water stress during meiosis from Ji et al (2010), Thakur et al (2010), and Dolferus et al (2013).…”

Section: Discussionsupporting

confidence: 94%

“…Male gametophyte development in wheat is reportedly more sensitive to water stress than the female reproductive part which is considered to be resilient to water stress during meiosis because the ovule is inverted, the micropyle bent down to the funiculus to which the body of the ovule is joined (termed as “anatropous” type of ovule) (Ji et al, 2010; Thakur et al, 2010; Dolferus et al, 2013). Pollen sterility is regarded as the major contributor to poor grain set in water-stressed wheat crops (Saini et al, 1984; Lalonde et al, 1997; Ji et al, 2010; Dolferus et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Water stress during the young microspore stage of pollen development in wheat can induce male sterility (Lalonde et al, 1997; Ji et al, 2010). The high sensitivity of male gametes to water stress has been attributed to the degradation of tapetum layers which contain the nutrients required for pollen development (Saini and Aspinall, 1981; Saini, 1997; Saini and Westgate, 1999; Dolferus et al, 2013). In contrast, female gametogenesis is reportedly physically protected, less vulnerable to abiotic stresses and resilient to water stress (Saini, 1997; Ji et al, 2010; Thakur et al, 2010; Dolferus et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Both Male and Female Malfunction Contributes to Yield Reduction under Water Stress during Meiosis in Bread Wheat

et al. 2017

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Water stress during meiosis in wheat is a major constraint to yield especially for the rainfed farming regions. Pollen sterility has been proposed as the most sensitive process leading to low seed set (low % of fertile spikelets), but here we show this is not universal, and that the development of female reproductive parts is equally if not more sensitive than male parts in many wheat cultivars. The first experiment examined water stress during meiosis in 46 wheat genotypes. The reduction in seed set varied widely, ranging from 6 to 48%. The second experiment differentiated the effect of water stress on the male or the female reproductive part in 13 wheat genotypes. Water stress was imposed during meiosis, with plants cross-pollinated 5 days later with pollen from stressed or unstressed plants used to pollinate emasculated stressed or unstressed female parts. Seed set and kernel weight were measured at maturity. Contrary to the well-held view that the male reproductive part is the major contributor to seed set reduction when water stress is experienced during meiosis, the stressed-female part was also a predominant contributor in four wheat genotypes among the 13 genotypes examined. This strongly indicates that both male and female parts are responsible for yield reduction when water-stressed during meiosis and suggests that it may be possible to breed tolerant wheat cultivars combining tolerance from both male and female reproductive parts.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Both Male and Female Malfunction Contributes to Yield Reduction under Water Stress during Meiosis in Bread Wheat

et al. 2017

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“…Similarly, the ‘cold spell’ or low temperature threshold for rice is 16°C, considerably higher than other cereal crops. Under cold conditions, rice exhibits poor seedling establishment at the start of the season, resulting in delayed growth and massive grain losses at the end of the season when temperatures drop below 16°C at night (Dolferus et al ). If temperatures drop below 12°C at the young microspore stage of rice pollen development, pollen sterility occurs resulting in maximum yield losses (Oliver et al , Powell et al ).…”

Section: Introductionmentioning

confidence: 99%

An osmotin from the resurrection plant Tripogon loliiformis (TlOsm) confers tolerance to multiple abiotic stresses in transgenic rice

Williams

2017

Physiologia Plantarum

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Osmotin is a key protein associated with abiotic and biotic stress response in plants. In this study, an osmotin from the resurrection plant Tripogon loliiformis (TlOsm) was characterized and functionally analyzed under abiotic stress conditions in T. loliiformis as well as in transgenic Nicotiana tabacum (tobacco) and Oryza sativa (rice) plants. Real-time PCR analysis on mixed elicitor cDNA libraries from T. loliiformis showed that TlOsm was upregulated a 1000-fold during the early stages of osmotic stresses (cold, drought, and salinity) in both shoots and roots but downregulated in shoots during heat stress. There was no change in TlOsm gene expression in roots of heat-stressed plants and during plant development. The plasma membrane localization of TlOsm was showed in fluorescent-tagged TlOsm tobacco plants using confocal laser scanning microscopic analysis. Transgenic rice plants expressing TlOsm were assessed for enhanced tolerance to salinity, drought and cold stresses. Constitutively expressed TlOsm in transgenic rice plants showed increased tolerance to cold, drought and salinity stress when compared with the wild-type and vector control counterparts. This was evidenced by maintained growth, retained higher water content and membrane integrity, and improved survival rate of TlOsm-expressing plants. The results thus indicate the involvement of TlOsm in plant response to multiple abiotic stresses, possibly through the signaling pathway, and highlight its potential applications for engineering crops with improved tolerance to cold, drought and salinity stress.

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“…It appears that the chlorophyll content at Day 16 of the heat treatment is a sufficient criterion for detecting tolerant lines under our experimental conditions. Many reproductive processes are affected by heat stress, including pollen development; development of stigma, style, and ovary; floret abortion and embryo abortion; and growth and development of individual grains (Dolferus et al 2013;Prasad and Djanaguiraman 2014). The post-anthesis heat-stress treatment was expected to affect single-kernel weight, but seed number was also strongly affected (Table 3).…”

Section: Discussionmentioning

confidence: 97%

Genetic Variation for Heat Tolerance in Primitive Cultivated Subspecies ofTriticum turgidumL.

Bowden

Prasad

et al. 2015

Journal of Crop Improvement

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High temperature (heat) stress is a major constraint for the productivity of crops worldwide. Wheat ( Triticum spp.) is particularly vulnerable to high temperature stress compared to other crops. The principal way to mitigate heat damage is to develop heat-tolerant varieties by identifying heat-tolerant germplasm and employing the tolerant lines in breeding programs. The objectives of this study were to investigate the genetic variation for heat tolerance in primitive cultivated subspecies of tetraploid wheat Triticum turgidum L. (AABB genome) and to identify heat-tolerant genotypes. Thirty-eight tetraploid wheat accessions belonging to five subspecies collected from 19 countries were studied for heat tolerance in day/night temperatures of 36/30 • C beginning at anthesis. Several lines were classified as heat-tolerant based on small reductions in seed number, single-kernel weight, and total grain weight, as well as slow chlorophyll degradation under heat stress. T. turgidum subsp. polonicum IG110572 from Algeria, T. turgidum subsp. dicoccum IG45067 from Oman, and T. turgidum subsp. dicoccum IG45393 from Eritrea had responses similar to the reference heat-tolerant hexaploid wheat, 'Kauz'. These heat-tolerant accessions may be useful to breeding programs for the improvement of heat tolerance in tetraploid or hexaploid wheat.

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The Physiology of Reproductive-Stage Abiotic Stress Tolerance in Cereals

Cited by 36 publications

References 141 publications

Both Male and Female Malfunction Contributes to Yield Reduction under Water Stress during Meiosis in Bread Wheat

Both Male and Female Malfunction Contributes to Yield Reduction under Water Stress during Meiosis in Bread Wheat

An osmotin from the resurrection plant Tripogon loliiformis (TlOsm) confers tolerance to multiple abiotic stresses in transgenic rice

Genetic Variation for Heat Tolerance in Primitive Cultivated Subspecies ofTriticum turgidumL.

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