Water Status of Flower Buds and Leaves as Affected by High Temperature in Heat-Tolerant and Heat-Sensitive Cultivars of Snap Bean (Phaseolus vulgarisL.)

Assessing Drought Tolerance of Snap Bean (Phaseolus Vulgaris) From Genotypic Differences In Leaf Water Relations,Shoot Growth and Photosynthetic Parameters

“…Under water stress conditions, snap bean continues vegetative growth, but only reduced at photosynthetic rates (Suzuki et al, 1987). In many crop species, including snap bean, even small diurnal fluctuations in leaf water status at anthesis can adversely affect the activity of reproduction structures (Saini and Aspinall, 1982;Kuo et al, 1988;Weaver and Timm, 1988;Tsukaguchi et al, 2003). Therefore, lack of photosynthate supply to reproductive organ may not be the only cause of premature abortion and abscission.…”

Effects of Temperature and Moisture on Growth of Common Bean and Its Resistance Reaction against Common Bacterial Blight (Xanthomonas axonopodis pv. phaseoli strains)

“…Increasing temperature until the optimum level for bacterial strains, and increasing relative humidity creates suitable condition for the development of CBB epidemics in susceptible common bean varieties [26]. However, at higher temperature, above the optimum level for bacterial blight development, especially above 30°C, the heat tolerant, disease resistant and drought resistant varieties adapt to high temperature and lower soil water content [29][30][31]. The drought resistant and disease resistant common bean varieties develop several adaptation mechanisms that allow the plant survival during hot and dry conditions [7,32].…”

“…phaseoli strains) of its reproductive organs [30]. In drought resistant varieties, tissue water content is kept high by restricting excessive vegetative growth and a large reduction in water potential.…”

“…Drought escape allows plants to accelerate their cell cycle with an early flowering and maturity, and rapidly relocates metabolites to seed production [8,30] and away from leaves and shoot tissues [33,34]. Drought avoidance is the capability to keep high tissue water potential through increased rooting depth, hydraulic conductance reduction, and radiation absorption reduction in leaves, water-loss area reduction, reduced absorption of radiation by leaf movement, and reduced surface evaporation [7,30,35].…”

“…During higher temperature and lower moisture, the disease resistant varieties will reduce disease development due to mobilization of resources into host resistance through various mechanisms, such as reduced stomata density and conductance [30]. Common beans adapt stress conditions of climate change variables through production of greater accumulation of carbohydrates such as waxes, extra layers of epidermal cells, increased fiber content and pH change in their cell cytoplasm [33,34].…”