Effect of glycinebetaine on function of thylakoid membranes in wheat flag leaves under drought stress

Zhao, Xiaoyan; Ma, Qian-Quan; Liang, Chaozhao; Fang, Yizhi; Wang, Y.-Q.; Wang, W.

doi:10.1007/s10535-007-0128-3

Cited by 53 publications

(31 citation statements)

References 17 publications

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“…Water stress damages thylakoid membranes, disturbs their function, and ultimately decreases photosynthesis and crop yield (Shah and Paulsen 2003, Huseynova et al 2007, Zhao et al 2007). Stay-green mutants are characterized by increased stability of chloroplast membranes and chlorophyll-protein complexes , Park et al 2007.…”

Section: Discussionmentioning

confidence: 99%

Improved drought resistance in a wheat stay-green mutant tasg1 under field conditions

et al. 2012

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We investigated the drought resistance of a wheat (Triticum aestivum L.) stay-green mutant tasg1 and its wild-type (WT) in field experiments conducted for two years. Drought stress was imposed by controlling irrigation and sheltering the plants from rain. Compared with the WT, tasg1 exhibited a distinct delayed senescence under both normal and drought stress conditions, as indicated by slower degradation of chlorophyll and decrease in net photosynthetic rate than in WT. At the same time, tasg1 mutants maintained more integrated chloroplasts and thylakoid ultrastructure than did WT plants under drought stress. Lower malondialdehyde content and higher antioxidative enzyme activities in tasg1, compared to WT, may be involved in the stay-green phenotype and drought resistance of tasg1.Additional key words: antioxidative defense system, chlorophyll degradation, chloroplast and thylakoid ultrastructures, drought stress, photosynthesis.

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Section: Discussionmentioning

confidence: 99%

Improved drought resistance in a wheat stay-green mutant tasg1 under field conditions

et al. 2012

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“…GB treatment had improved yield performance of studied genotypes under drought stress by better net photosynthetic assimilation (Gupta and Thind, 2015;Kausar et al, 2014), enhanced photo-inhibition tolerance of PSII (Ma et al, 2006;Cha-um et al, 2013), activation of antioxidant enzymes, stabilization of thylakoid membranes and suppression of chlorophyll degradation (Zhao et al, 2007). In addition to osmoregulation, role of GB in ion homeostasis, stabilization of membranes and proteins (such as Rubisco), modification of chloroplast ultrastructure, maintenance of gas exchange and photosynthesis, acceleration of antioxidant enzyme activities to scavenge reactive oxygen species (Molla et al, 2014;Hasanuzzaman et al, 2014), accumulation of other osmolytes (eg.…”

Section: Biological Yield Per Sqm (By) and Grain Yield (Gy) Per Sqmmentioning

confidence: 99%

Grain yield response of drought stressed wheat to foliar application of glycine betaine

Gupta

Thind

2017

IJARe

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A field experiment was conducted to investigate influence of exogenous application of glycine betaine (GB) on performance of wheat under prolonged drought conditions. A set of 19 wheat genotypes differing in stress sensitivity, were sprayed with 100mM GB at maximum tillering and anthesis stage. GB treatment significantly declined the phenological pace under drought stress by increasing days to anthesis. Foliar applied GB improved grains/spike and thousand grain weight of selected wheat genotypes over stressed ones. The genotype specific response to GB application suggested some threshold optimum level to be necessary for yield improvement under drought stress in susceptible genotypes as compared with tolerant ones. In overall, GB alleviated negative effects of drought stress by a rise in harvest index of most genotypes suggesting its role in assimilate translocation.

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“…Stress damages the thylakoid membrane, disturbs its functions, and ultimately decreases photosynthesis and crop yield (Shah and Paulsen 2003, Huseynova et al 2007, Zhao et al 2007. Preservation of the photosynthetic apparatus is an important strategy for enhancing crop yield under stress.…”

Section: Introductionmentioning

confidence: 99%

Overaccumulation of glycine betaine enhances tolerance of the photosynthetic apparatus to drought and heat stress in wheat

et al. 2010

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To investigate the role of glycine betaine in photosynthesis under stress, a transgenic wheat (Triticum aestivum L.) line T6 overaccumulating glycine betaine and its wild type Shi4185 were used. Seedlings were exposed to conditions of drought (30%, PEG-6000), heat (40°C) and their combination. The results revealed ultrastructural damage to the chloroplast and thylakoid lamellae with the withered phenotype by both drought and heat stress, and the damage was exacerbated by the combination of drought and heat. The appearance of a K step in the typical O-J-I-P curve and the decrease of Hill activity indicated a reduction of oxygen evolving complex function caused by stress. The greater damage was found in wild type than T6. Overaccumulation of glycine betaine in T6 could protect lipids in the thylakoid membrane from damage and stabilize the index of unsaturated fatty acids under stress. A lower ratio of monogalactosyl diacylglycerol/digalactosyl diacylglycerol and higher phosphatidylglycerol content in the thylakoid membrane of T6 were also observed under stress. These effects can promote stability of the thylakoid membrane. Otherwise, glycine betaine overaccumulation decreased photoinhibition of PSII under stress. The results also suggest that xanthophyll cycle-dependent non-radiative energy dissipation may be involved in the GB-mediated effects on PSII function under stress conditions.

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Effect of glycinebetaine on function of thylakoid membranes in wheat flag leaves under drought stress

Cited by 53 publications

References 17 publications

Improved drought resistance in a wheat stay-green mutant tasg1 under field conditions

Improved drought resistance in a wheat stay-green mutant tasg1 under field conditions

Grain yield response of drought stressed wheat to foliar application of glycine betaine

Overaccumulation of glycine betaine enhances tolerance of the photosynthetic apparatus to drought and heat stress in wheat

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