Inheritance of resistance to temperature-drought stress in the snap bean

Effects of water stress applied at different phenological phases on yield components of dwarf bean (Phaseolus vulgaris L.)

“…This mechanism explains the macroscopic observations: stress increases the drying up of leaves [26], pollen seeds and the stigma. This phenomenon is accentuated in the case of high or low [4] temperatures. Water stress can also decrease the flow of assimilates between the different organs of the plant, in particular between leaves and fruiting organs [12].…”

Snap Bean

“…For snap bean research workers it is widely accepted that high temperatures disrupt the pollination-fertilization cycle (Bouwkamp and Summers, 1982). The optimum pollen germination temperature has been shown to be 15 o C with germination inhibition in sensitive varieties at 30 o C (Admad, Bouwkamp and Summers, 1982). A study on flowers that had abscised at high temperatures showed that fertilization had not taken place.…”

“…This led to the conclusion that blossom abscission may be due to the inability of pollen grains to germinate at high temperatures. A high negative coefficient of correlation between temperature (15 o C-35 o C) and the percentage of pods set was estimated (Iwani, Bouwkamp and Summers, 1982). Pollen sterility was associated with tapetal degeneration, when pollen sterility was induced by high air temperature, 8 to 11 days before flowering in the snap bean (Suzuki et al, Suzuki et al, 2001).…”

“…It is determined by the number of pods, which is a product of the number of flowers and pod-set-ratio. The mode of inheritance to stress caused by high temperature was due to a single dominant gene and two genes with epistatic action (Bouwkamp and Summers, 1982). Often a high temperature coincides with a high solar radiation and causes excessive transpiration.…”

Common Bean ( Phaseolus vulgaris L.)

“…Photoperiod sensitivity alleles are also known to interact with high temperatures to exacerbate photoperiod CRC Press, LLC sensitivity such that in tropical lowlands, highly sensitive genotypes may develop elongated internodes, remain vegetative, and not flower at all. Bouwkamp and Summers (1982) reported that a single dominant or two complementary dominant alleles controlled resistance to high temperature-drought stress in common bean. Shonnard and Gepts (1994) also documented that determinacy (fin gene), or a factor tightly linked to it, induced susceptibility to heat in the Central Valley of California.…”