Pyramiding seed dormancy genes to improve resistance of semi-dwarf varieties to pre-harvest sprouting in rice

Wang, Junwei; Korkmaz, Uğur; Guo, Ming; Pipatpongpinyo, Wirat; Gu, Xing‐You

doi:10.1007/s11032-020-01172-2

Cited by 7 publications

(8 citation statements)

References 37 publications

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“…Some associations between seed dormancy and plant height have been reported; for example, semidwarf genotypes have deeper seed dormancy than tall genotypes, and semidwarf 1 ( sd1 ), associated with GA biosynthesis, regulates seed dormancy and semidwarf plant height 38 , 39 . Seed dormancy in cereal crops should be moderate (not too much, but not lacking altogether) because lack of seed dormancy causes preharvest sprouting which significantly reduces the yield and quality of cereal crops 40 , 41 .…”

Section: Discussionmentioning

confidence: 99%

Genomic divergence during feralization reveals both conserved and distinct mechanisms of parallel weediness evolution

et al. 2021

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Agricultural weeds are the most important biotic constraints to global crop production, and chief among these is weedy rice. Despite increasing yield losses from weedy rice in recent years worldwide, the genetic basis of weediness evolution remains unclear. Using whole-genome sequence analyses, we examined the origins and adaptation of Japanese weedy rice. We find evidence for a weed origin from tropical japonica crop ancestry, which has not previously been documented in surveys of weedy rice worldwide. We further show that adaptation occurs largely through different genetic mechanisms between independently-evolved temperate japonica- and tropical japonica-derived strains; most genomic signatures of positive selection are unique within weed types. In addition, some weedy rice strains have evolved through hybridization between weedy and cultivated rice with adaptive introgression from the crop. Surprisingly, introgression from cultivated rice confers not only crop-like adaptive traits (such as shorter plant height, facilitating crop mimicry) but also weedy-like traits (such as seed dormancy). These findings reveal how hybridization with cultivated rice can promote persistence and proliferation of weedy rice.

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Section: Discussionmentioning

confidence: 99%

Genomic divergence during feralization reveals both conserved and distinct mechanisms of parallel weediness evolution

et al. 2021

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“…Also important is the search of associations with other traits; indeed, as dormancy is regulated by multiple genes, several of those genes may have been unconsciously selected together with other agronomic-interesting traits. For example, dwarf and semi-dwarf genotypes in rice and wheat are more dormant and PHS-resistant than taller genotypes because of reduced GA content or signalling (Flintham and Gale, 1982; Wu et al, 2011; Ye et al, 2013, 2015; Wang et al, 2020). This causal relationship does not seem to apply in sorghum, where genes regulating plant stature are not related to the GA pathway, but involve regulators of other hormonal pathways (Hilley et al, 2016; Yamaguchi et al, 2016; Hirano et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…During the domestication of cereals, selection pressure towards rapid and uniform germination (either for malting or sowing a new crop) favoured less-dormant genotypes as compared with wild ancestors. In some cases, low-dormancy genes were selected along with other (desirable) traits such as low-pigmented grains, reduced flowering time and low plant stature [discussed by Wang et al (2020)]. For example, increased pigmentation has been frequently associated with deeper dormancy in cereals like rice, wheat, barley and maize [Gu et al, 2011; Himi and Noda, 2005; also discussed in Rodríguez et al (2015)].…”

Section: Introductionmentioning

confidence: 99%

Phenotyping for resistance to pre-harvest sprouting in grain sorghum

et al. 2021

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Pre-harvest sprouting (PHS) is a common threat to cereal crops in which the grain maturation phase takes place under rainy, moist conditions. Susceptibility to PHS is higher in sorghum genotypes displaying low levels of seed dormancy before harvest maturity. Other attributes such as glume or panicle morphology may also affect susceptibility to PHS. Breeding for resistance to PHS in grain sorghum requires the identification of grain physiological and morphological attributes affecting this trait, and a protocol for phenotyping and rating genotypes according to their susceptibility to PHS. In this work, we tested germination under laboratory conditions using detached grains and intact panicles for a panel of 20 sorghum genotypes including 11 parental lines, 6 hybrids and 3 reference inbred lines with contrasting PHS response. Records for natural sprouting in the field for these genotypes were also included in the analysis. Multivariate analyses of germination data allowed separation of genotypes into two major categories (resistant and susceptible to PHS). Laboratory germination data correlated significantly with PHS in the field. In most genotypes, the glumes had a significant, inhibitory effect on germination. The low levels of grain dormancy were observed among high tannin backgrounds, and vice versa, indicating that a pigmented testa alone does not provide resistance to PHS. Altogether, the phenotyping protocol allowed the classification of sorghum genotypes according to their susceptibility to PHS and the identification of different attributes useful for breeding for PHS resistance in this crop.

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“…Transcription factors also play a crucial role for regulating the signal transduction and hormonal expression in rice. Hobo et al [ 124 ], Wang et al [ 9 ], and Wu et al [ 125 ] demonstrated the interaction between VP1 and TRAP1 (bZIP transcription factor) and Rc (basic helix–loop–helix (bHLH) transcription factor) genes for ABA regulation. In addition, Xu et al [ 62 ] demonstrated the implication of the glutaredoxin-mediated gene PHS9 acting as a negative regulator of both ABA and ROS signaling during seed germination.…”

Section: Omics Approaches For Pre-harvest Sprouting In Ricementioning

confidence: 99%

“…It also promotes starch hydrolysis in endosperm, resulting in lower grain weight and creating a favorable environment for saprophytic fungi [ 8 ]. In addition, selection for rapid, uniform germination over the course of domestication and breeding has reduced seed dormancy and thus increased the susceptibility of cereal plants to pre-harvest sprouting [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Seed Dormancy and Pre-Harvest Sprouting in Rice—An Updated Overview

Sohn

Subramanian

Thamilarasan

et al. 2021

IJMS

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Pre-harvest sprouting is a critical phenomenon involving the germination of seeds in the mother plant before harvest under relative humid conditions and reduced dormancy. As it results in reduced grain yield and quality, it is a common problem for the farmers who have cultivated the rice and wheat across the globe. Crop yields need to be steadily increased to improve the people’s ability to adapt to risks as the world’s population grows and natural disasters become more frequent. To improve the quality of grain and to avoid pre-harvest sprouting, a clear understanding of the crops should be known with the use of molecular omics approaches. Meanwhile, pre-harvest sprouting is a complicated phenomenon, especially in rice, and physiological, hormonal, and genetic changes should be monitored, which can be modified by high-throughput metabolic engineering techniques. The integration of these data allows the creation of tailored breeding lines suitable for various demands and regions, and it is crucial for increasing the crop yields and economic benefits. In this review, we have provided an overview of seed dormancy and its regulation, the major causes of pre-harvest sprouting, and also unraveled the novel avenues to battle pre-harvest sprouting in cereals with special reference to rice using genomics and transcriptomic approaches.

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Pyramiding seed dormancy genes to improve resistance of semi-dwarf varieties to pre-harvest sprouting in rice

Cited by 7 publications

References 37 publications

Genomic divergence during feralization reveals both conserved and distinct mechanisms of parallel weediness evolution

Genomic divergence during feralization reveals both conserved and distinct mechanisms of parallel weediness evolution

Phenotyping for resistance to pre-harvest sprouting in grain sorghum

Seed Dormancy and Pre-Harvest Sprouting in Rice—An Updated Overview

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