Under artificial acid rain of pH<4.0, leaves of Cowpea were damaged, chlorophyll content, photosynthetic rate and POD activity amount decreased, while membrane permeability and stomatal aperture of leaf increased.
The seed selection system is used to select the new cowpea 2 from the green cowpea 90.The breeding shows earliness,the leaves are medium size,the meat of leaf is thick,dark green.