Parallel origins of photoperiod adaptation following dual domestications of common bean. (20th February 2019)

• Record Type: Journal Article
• Authors: Weller, James L; Vander Schoor, Jacqueline K; Perez-Wright, Emilie C; Hecht, Valérie; González, Ana M; Capel, Carmen; Yuste-Lisbona, Fernando J; Lozano, Rafael; Santalla, Marta
• Is Part Of: Journal of experimental botany. Volume 70:Number 4(2019)
• Page Start: 1209
• Page End: 1219
• Publication Date: 2019-02-20
• Subjects: Common bean -- florigen -- flowering -- Phaseolus -- photoperiod -- phytochrome; Botany -- Periodicals; Botany, Experimental -- Periodicals; Plant physiology -- Periodicals; 580
• DOI: 10.1093/jxb/ery455
• Languages: English
• ISSNs: 0022-0957

Abstract

Abstract : Alteration of photoperiod sensitivity has been critical for broad global adaptation of common bean, and has arisen through different changes to the same phytochrome photoreceptor gene following two independent domestications. Abstract: Common bean ( Phaseolus vulgaris L.) is an important grain legume domesticated independently in Mexico and Andean South America approximately 8000 years ago. Wild forms are obligate short-day plants, and relaxation of photoperiod sensitivity was important for expansion to higher latitudes and subsequent global spread. To better understand the nature and origin of this key adaptation, we examined its genetic control in progeny of a wide cross between a wild accession and a photoperiod-insensitive cultivar. We found that photoperiod sensitivity is under oligogenic control, and confirm a major effect of the Ppd locus on chromosome 1. The red/far-red photoreceptor gene PHYTOCHROME A3 (PHYA3) was identified as a strong positional candidate for Ppd, and sequencing revealed distinct deleterious PHYA3 mutations in photoperiod-insensitive Andean and Mesoamerican accessions. These results reveal the independent origins of photoperiod insensitivity within the two major common bean gene pools and demonstrate the conserved importance of PHYA genes in photoperiod adaptation of short-day legume species.