1Botanica, Colegio de Postgraduados. Carretera Mexico-Texcoco, km 36.5, Montecillo, 56230, Mexico
2Campo Experimental Sierra de Chihuahua-INIFAP. Avenida Hidalgo 1213, Colonia Centro, Cuidad Cuauhtemoc, Chihuahua, Mexico
3CONACYT-Botanica, CONACyT-Colegio de Postgraduados. Carretera Mexico-Texcoco, km 36.5, Montecillo, 56230, Mexico
*Corresponding Author: D. Padilla Chacon, CONACYT-Botanica, CONACyT-Colegio de Postgraduados. Carretera Mexico-Texcoco, km 36.5, Montecillo, 56230, Mexico, Email: daniel.padilla@colpos.mx
Online published on 22 July, 2021.
Common bean (Phaseolus vulgaris L.) grain filling is vulnerable to drought and heat stress. The objective of the study was to evaluate the effect of humidity restriction, high night temperatures and their combination in common bean.
The plants were grown in pots at maximum field capacity (100% FC) until the grain filling began. Afterwards, maintained until harvest at: 1) 100% FC, 2) 50% FC at ambient day/night temperature (AT), 22.58°C/16.94°C, 3) 100% FC with high night temperature (HNT) 21.47°C and 4) 50% FC with HNT (combined stress). Evaluations included phenotypic assessment using red-green-blue color segmentation in: green (healthy), yellow (senescence) and brown (necrotic).
The combined stress in the cv. Rosa Bufa significantly and synchronously accelerated leaves and pods senescence. In contrast, in leaves of cv. OTI, the loss of green color began several days earlier than in pods. The effect of HNT and combined stress depends on common bean cultivar.
Common bean, Drought, High night temperature, Phenotyping, Senescence, Stay green
