Heterosis in yield,fiber quality,and photosynthesis of okra leaf oriented hybrid cotton (<Emphasis Type="Italic">Gossypium hirsutum</Emphasis> L.) |
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| Authors: | Wei Zhu Kui Liu Xue-De Wang |
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| Institution: | (1) Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310029, People’s Republic of China;(2) Agriculture and Agri-Food Canada, Greenhouse and Processing Crops Research Centre, Harrow, ON, Canada, N0R 1G0 |
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| Abstract: | Leaf shape is an important factor affecting canopy structure, photosynthetic characteristics, and yield. Introducing okra
leaf shape is considered an important strategy in cotton heterosis breeding. The objective of the study was to evaluate the
heterosis in okra leaf cotton hybrid F1s, which were developed by crossing two sterile near isolines and three restorer near isolines. A normal leaf check hybrid
F1, Zhongza 29, and four newly developed okra leaf oriented hybrid F1s, including the super-okra (severely cleft and narrowly lobed leaf), okra (deeply cleft and narrowly lobed leaf), semi-okra
(intermediate leaf lobe), and sub-okra (large leaf lobe) hybrids were selected in this experiment. Okra leaf oriented cotton
hybrids significantly reduced leaf area index (LAI) (P < 0.0001), thus more light penetrated into the lower canopy. The LAIs for the super-okra and okra hybrids, however, were too
small to supply adequate photosynthate, thus resulting in early maturity, short boll filling period, and low yield. As the
LAI increases, the semi-okra and sub-okra hybrids showed certain heterosis. The semi-okra hybrid showed 7–12% heterosis over
the check hybrid in lint percent, 6–11% in boll weight, 2–147% in canopy light intensity, 1–10% in net photosynthetic rate
(Pn), and −3 to 3% in lint yield. As well, all tested okra leaf hybrids improved fiber quality such as micronaire compared
with the normal leaf check hybrid. The results suggested that adopting okra leaf parental lines in cotton breeding provided
potentials in increasing fiber quality with comparable lint yield. |
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| Keywords: | Gossypium hirsutum Heterosis Light interception Okra leaf cotton Photosynthetic rate Yield |
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