Structural and biochemical mechanism responsible for the stay-green phenotype in common wheat

Luo, Peigao; Ren, Zhenglong; Wu, Xianjian; Zhang, Huaiyu; Zhang, Huaiqiong; Feng, Jia‐Xun

doi:10.1007/s11434-006-2175-0

Cited by 39 publications

(41 citation statements)

References 35 publications

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“…Delayed leaf senescence can prolong the supply of assimilated carbon to grains during the grainfilling period, thereby ensuring maximum mass per grain. For instance, CN17 is another stay-green wheat mutant reported (Luo et al 2006). MY11 was the most important agronomical parent in the pedigree of CN17.…”

Section: Tasg1 Is a Functional Stay-green Mutant With The Characterismentioning

confidence: 99%

The antioxidative defense system is involved in the delayed senescence in a wheat mutant tasg1

et al. 2012

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Wheat, which is the most important food crop worldwide, is a cereal that presents considerable potential for increased yield. A new wheat (Triticum aestivum L.) mutant tasg1 with delayed leaf senescence was constructed using ethyl methane sulfonate as a mutagen. Natural senescence in tasg1 was distinctly delayed in the field, as indicated by the slower progression of chlorophyll degradation, net photosynthetic rate than its wild type. Further, the malondialdehyde and the hydrogen peroxide content was lower and antioxidative enzyme activity higher in tasg1 than those in its wild type during both natural senescence and methyl viologen-induced oxidative stress. The results suggest that tasg1 is a functional stay-green wheat mutant with the Type B (in which senescence initiates on schedule, but progresses at a rate lower than that in the respective WTs) or Type A (in which senescence initiates late but proceeds at a normal rate) and B combination and that the competence of the antioxidant defense system is one of the most important mechanisms underlying the expression of the stay-green phenotype.

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Section: Tasg1 Is a Functional Stay-green Mutant With The Characterismentioning

confidence: 99%

The antioxidative defense system is involved in the delayed senescence in a wheat mutant tasg1

et al. 2012

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“…Spano et al (2003) reported that functional stay-green mutants of durum wheat maintained longer photosynthetic activity, had higher seed weights, and yielded more grain than the parental genotype. Luo (2006) also reported a new stay-green wheat cultivar "CN17" with delayed leaf senescence maintained longer and higher photosynthetic competence compared with the control cultivar and this aspect was correlated with the difference in chloroplast development.…”

mentioning

confidence: 86%

Physiological characteristics of a functional stay-green rice “SNU-SG1” during grain-filling period

Yan

Lee

2009

J. Crop Sci. Biotechnol.

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Functional stay-green has been regarded as a promising characteristic to be introduced for improving rice yield potential. A functional stay-green rice "SNU-SG1" that was identified from japonica rice collections was compared with two regular high-yielding rice cultivars (HYVs) for the temporal change of leaf chlorophyll, soluble protein, and root activity, and nitrogen accumulation and remobilization during the grain-filling period. SNU-SG1 had slower decreasing rate and maintained higher concentration of chlorophyll and soluble protein in upper four leaves during the grain-filling period than HYVs "Suweon490" and "Andabyeo", revealing a typical stay-green characteristic. Even though SNU-SG1 remobilized almost the same proportion of N accumulated before heading as HYVs to grain, it maintained much higher leaf N concentration due to the significantly higher N accumulation that is ascribable to the higher root activity sustenance during grain-filling period. The functional stay-green trait of SNU-SG1 seems to stem not only from the genetic control preventing chlorophyll degradation but also from the higher capacity to absorb N from soil due to the sustained strong root activity during grain-filling period. SNU-SG1 exhibited higher crop growth rate during late grain-filling period than HYVs, resulting in higher grain-filling percentage and non-structural carbohydrate re-accumulation in the stem at the final stage of grain filling. It is concluded that SNU-SG1 has a promising trait "functional stay-green" contributable to rice yield potential improvement through the improved grain filling.The functional stay-green trait during grain filling that results from a delay in the onset of leaf senescence or a slower decrease of chlorophyll content and photosynthetic activity (Thomas and Howarth 2000) will probably extend the assimilatory capacity of the canopy and might contribute to higher grain yields (Gwathmey et al. 1992). Spano et al. (2003) reported that functional stay-green mutants of durum wheat maintained longer photosynthetic activity, had higher seed weights, and yielded more grain than the parental genotype. Luo (2006) also reported a new stay-green wheat cultivar "CN17" with delayed leaf senescence maintained longer and higher photosynthetic competence compared with the control cultivar and this aspect was correlated with the difference in chloroplast development.Grain filling and leaf assimilation sustenance are usually conflicting processes in monocarpic cereal crops as the amount of N absorbed during grain filling is much smaller than the amount of N accumulated in mature grains. Thus, a large part of grain N is remobilized from vegetative organs especially from leaf blades to the developing grain (Mae 1997), causing leaf senescence and decrease of photosynthesis after flowering. As plant leaves, particularly chloroplasts, are sites of protein accumulation, mobilization of chloroplast protein is a central metabolic activity in leaf senescence and most of the mobilizable protein in a leaf is soluble protein...

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“…These translocations had been previously characterized using various cellular and molecular analyses (Luo et al 2006(Luo et al , 2013Zhang et al 2008). However, more studies are needed to better understand the mechanism underlying the origin of these novel traits and to obtain information about the involvement of 1BL/1RS translocation in the adaptation of plants to stress conditions.…”

Section: Introductionmentioning

confidence: 99%

Polyamine plays key role in different osmotic stress responses of wheat-rye 1BL/1RS translocation lines

Deng

Zhou

et al. 2016

Cereal Research Communications

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It is well demonstrated that wheat-rye 1BL/1RS translocated chromosome leads to some valuable novel traits such as disease resistance, high yield and functional stay-green after anthesis. To understand the physiological mechanism of 1BL/1RS translocation responsible for osmotic stress, two wheat cultivars, CN12 and CN17, carrying the translocated chromosome and MY11 without the translocated chromosome were employed in the study. During 5-day osmotic stress, fresh weight inhibition, chlorophyll content, soluble protein content, MDA concentration, antioxidant enzymes activity and free polyamines content were examined. CN12 and CN17, especially cultivar CN17, registered greater biomass and minor oxidative damage compared with their wheat parent. Meanwhile, the concentration of Spd and Spm in CN17 was significantly higher than the others. In addition, we found a positive correlation of fresh weight inhibition (FWI) and Put concentration, and a negative one with the parameters (Spd + Spm): Put ratio, indicating the importance of higher polyamine (Spd and Spm) accumulation on the adaptation to osmotic stress. Therefore, we proposed that the accumulation of higher polyamines (Spd and Spm) should play an important role on the adaptation of 1BL/1RS translocation lines to osmotic stress and might be important factors for the origin of novel traits introduced by 1BL/1RS.

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Structural and biochemical mechanism responsible for the stay-green phenotype in common wheat

Cited by 39 publications

References 35 publications

The antioxidative defense system is involved in the delayed senescence in a wheat mutant tasg1

The antioxidative defense system is involved in the delayed senescence in a wheat mutant tasg1

Physiological characteristics of a functional stay-green rice “SNU-SG1” during grain-filling period

Polyamine plays key role in different osmotic stress responses of wheat-rye 1BL/1RS translocation lines

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