Inheritance of the cracking characteristics of abscission layer and its relation with the degree of grain shedding |
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Authors: | Dam Xuan Van Il-Doo Jin |
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Institution: | (1) Institute of Biology, Maria Curie-Sklodowska University, Akademicka 19, PL-20-033 Lublin, Poland;(2) Institut für Entwicklungsbiologie, Universität zu Köln, D-50923 Köln, Germany; |
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Abstract: | Seed shattering is an undesirable characteristic of rice cultivars affecting field loss of grain yield before and during harvesting.
This research was designed to clarify the inheritance of the cracking characteristics of abscission layers formed between
the rice grains and its pedicel using F2 populations derived from the crossing of Milyang 23 and Ashahi. The results indicated that the cracking characteristic of
Milyang 23 was dominant to absence of cracking in Ashahi, and controlled by a single dominant gene. The degrees of grain shedding
were somewhat related with the cracking characteristics of the abscission layer. The breaking tensile strengths closely correlated
with the diameter of the supporting zone, the thickness of sclerenchyma tissue between the inner side of abscission layer
and the central vascular tissues in the lemma side, and in the palea side, respectively. Some negative correlations were observed
between the breaking tensile strengths and some agronomic traits such as plant height, culm length, panicle length, number
of matured grains, and the ratio of fertility. |
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