Heterosis Studies on Photosynthetic and Physiological Performance of the Subtending Leaf of Cotton Boll of CCRI 63
This study explored the formation mechanism of heterosis in the hybrid cotton CCRI 63.CCRI 63 and its two parents were used to determine the physiological and photosynthetic characteristics of the subtending leaf at various developmental stages of the cotton boll.Results revealed: (1) Yield heterosis of CCRI 63 was obvious;boll number per plant of CCRI 63 was 21.52％ and 43.28％ higher than the two parents, respectively.In addition, the boll weight of CCRI 63 was 2.42％ and 19.31％ greater than its parents, respectively, and the boll load of unit leaf area was 22.39％ and 22.30％ greater.(2) Physiological characteristics of the CCRI 63 subtending leaf exhibited significant heterosis in the late development stage of boll-forming.The subtending leaf area of CCRI 63 was 26.60％ and 59.41％ greater than its parents, respectively.The high-level of superoxidase dismutase activity may have allowed physiological metabolism in the subtending leaf of CCRI 63 to improve significantly.Meanwhile, the low-level of malondialdehyde activity likely reduced cell membrane damage and delayed subtending leaf senescence in CCRI 63.(3) The photosynthetic performance of the CCRI 63 subtending leaf displayed significant heterosis in the late stage of boll development.In the late cotton boll development stage, the high-level chlorophyll content and sucrose phosphate synthase activity allowed CCRI 63 to maintain efficient photosynthesis and accumulate more photosynthetic products, which might lead to CCRI 63 obtaining a higher boll number per plant and boll weight, and thus obtain higher yields.
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