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- W2905992995 abstract "Stay-green plants are defined as those whose leaves have an extended period of green color compared to normal genotypes. Stay-green mutations are classified as either cosmetic or functional. Plants possess a functional stay-green phenotype if they continue to photosynthesize for a longer period than is normal. During the senescence of plants with cosmetic stay-green, chlorophyll is retained but the plant loses its capacity to photosynthesize. Cosmetic stay-green comes about as a result of mutations rendering enzymes in the chlorophyll catabolic pathway nonfunctional. Cosmetic stay-green mutants were first identified in forage/turf grass species and rice, and have since been identified in tomato, pepper, and common bean. In nearly every case, a homolog of the stay-green gene (SGR) is involved. Plant breeders have capitalized on the use of functional stay-green in field crops because of their ability to enhance yield and provide tolerance to abiotic stresses. Maize and sorghum breeders in particular have used functional stay-green to boost yields. On the other hand, cosmetic stay-green traits have been instrumental helping researchers gain a better understanding of the photosynthetic process, and especially the chloroplast catabolism pathway, but the trait has not been regarded as useful for genetic improvement. In this chapter, we wish to highlight the importance of cosmetic stay-green for quality traits in specialty crops. Genomics and bioinformatics tools, along with the sequenced genomes of a number of crops, have supercharged the study of senescence such that our understanding of the chlorophyll catabolic pathway is fairly complete and has enhanced the ability to associate genes with phenotypes. Several crops show phenotypic characteristics of stay-green traits, but they have not yet been characterized at the molecular level in order to confirm a mutation in the chlorophyll senescence pathway; these represent opportunities for further research. Such crops include cucumber, lentil, lima bean, mung bean, cowpea, and fava bean, among others. Cosmetic stay-green mutations contribute to increased quality in a number of crops, including dry edible peas and beans, garden peas and snap beans, tomatoes, and peppers. In some cases (e.g., peas), the economic value of cosmetic stay-green is considerable. Overall, the value of the stay-green characteristic in these crops has a positive economic impact all along the supply chain, from the producer to fresh markets and processing industries, and has the potential to benefit other crops. Cosmetic stay-green may also be associated with undesirable effects—mainly in relation to germination and vigor in certain species. This too represents a research opportunity." @default.
- W2905992995 created "2019-01-01" @default.
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- W2905992995 date "2018-12-21" @default.
- W2905992995 modified "2023-10-16" @default.
- W2905992995 title "The Importance of Cosmetic Stay‐Green in Specialty Crops" @default.
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- W2905992995 doi "https://doi.org/10.1002/9781119521358.ch6" @default.
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