Breeding of commercially acceptable allelopathic rice cultivars in China

Kong, Chui‐Hua; Chen, Xiong-Hui; Hu, Fei; Zhang, Songzhu

doi:10.1002/ps.2154

Cited by 76 publications

(74 citation statements)

References 31 publications

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“…This study is the first to demonstrate that momilactones A and B correlated to the tolerance of drought and salinity in much stronger levels than the weed tolerance in rice. Molecular breeding may be much more useful than traditional breeding (Kong et al 2011), but the location of QTLs/genes involved in plant growth inhibitors has met limited success (Jensen et al 2001). Many QTLs involved in the drought and salinity have been detected, but these traits often do not comply with rice quality such as amylose and protein content, that is the major constraint in breeding rice tolerance to drought and salinity.…”

Section: Correlation Coefficientsmentioning

confidence: 99%

Allelopathic momilactones A and B are implied in rice drought and salinity tolerance, not weed resistance

Xuan

Minh

Anh

et al. 2016

Agron. Sustain. Dev.

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Momilactones A and B are allopathic phytoalexins that are involved in weed resistance of rice. There is little knowledge on the roles of momilactones A and B on drought and salinity tolerance. Here we analyzed the contents of momilactones A and B in 30 rice cultivars of various origins including hybrid, foreign, sticky, local, upland sticky, and upland rice of the two subtypes Indica and Japonica. Momilactone contents were compared with salinity tolerance, drought tolerance, weed resistance, total flavonoids, total phenols, and antioxidant capacity. Results show that, contrary to the current knowledge, momilactones A and B have very low correlation with weed resistance, with r coefficients of 0.001 and 0.09, respectively. Correlation was higher with drought tolerance, of 0.65 for momilactones A and 0.27 for momilactones B. Overall we conclude that the development of bioactive reagents derived from momilactones A and B is more potent to reduce salinity and drought stresses than weed tolerance in rice.

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Section: Correlation Coefficientsmentioning

confidence: 99%

Allelopathic momilactones A and B are implied in rice drought and salinity tolerance, not weed resistance

Xuan

Minh

Anh

et al. 2016

Agron. Sustain. Dev.

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“…Given the multiple growth-inhibiting compounds that have been identified in rice exudates, it is likely that more than one biosynthetic pathway is required to generate strong allelopathic properties. Nevertheless, natural variation in the production of allelopathic compounds has the potential to be incorporated into breeding programs for production of rice cultivars that are naturally weedsuppressive (Olofsdotter, 2001a;Kong et al, 2011). Such breeding efforts will be facilitated by the identification of specific rice genes that catalyze the formation of allelopathic compounds.…”

Section: Introductionmentioning

confidence: 99%

The Tyrosine Aminomutase TAM1 Is Required for β-Tyrosine Biosynthesis in Rice

et al. 2015

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ORCID IDs: 0000-0001-8597-9841 (J.Y.); 0000-0002-0121-0048 (S.R.S.); 0000-0002-9675-934X (G.J.)Non-protein amino acids, often isomers of the standard 20 protein amino acids, have defense-related functions in many plant species. A targeted search for jasmonate-induced metabolites in cultivated rice (Oryza sativa) identified (R)-b-tyrosine, an isomer of the common amino acid (S)-a-tyrosine in the seeds, leaves, roots, and root exudates of the Nipponbare cultivar. Assays with 119 diverse cultivars showed a distinct presence/absence polymorphism, with b-tyrosine being most prevalent in temperate japonica cultivars. Genetic mapping identified a candidate gene on chromosome 12, which was confirmed to encode a tyrosine aminomutase (TAM1) by transient expression in Nicotiana benthamiana and in vitro enzyme assays. A point mutation in TAM1 eliminated b-tyrosine production in Nipponbare. Rice cultivars that do not produce b-tyrosine have a chromosome 12 deletion that encompasses TAM1. Although b-tyrosine accumulation was induced by the plant defense signaling molecule jasmonic acid, bioassays with hemipteran and lepidopteran herbivores showed no negative effects at physiologically relevant b-tyrosine concentrations. In contrast, root growth of Arabidopsis thaliana and other tested dicot plants was inhibited by concentrations as low as 1 mM. As b-tyrosine is exuded into hydroponic medium at higher concentrations, it may contribute to the allelopathic potential of rice.

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“…For decades, attempts have been made to enhance the allelopathic properties of crops by conventional breeding and variety selection (Batish et al, 2011;Bertholdsson et al, 2012;Worthington and Reberg-Horton, 2013). However, to our knowledge, rice (Oryza sativa) is the only crop for which there are allelopathic germplasm releases produced by conventional breeding (Kong et al, 2011;Gealy and Yan, 2012;Gealy et al, 2013). Much, if not all, of the allelopathy of rice is due to momilactones that are exuded from rice roots (Kato-Noguchi, 2004;Kong et al, 2004).…”

Section: Potential Use Of Natural Products As Pip Bioherbicidesmentioning

confidence: 99%