Indian Society of Genetics & Plant Breeding
Presence of hard seeds in seed lots reduces the seedling
emergence percentage in field leading to non-uniform,
lowered plant population and uneven maturity. Seed
hardness, characterized by no water imbibition, is
controlled by both genetic and environmental conditions.
To estimate the broad sense heritability (H2) of
hardseededness, 20 mungbean genotypes with >22% hard
seeds were grown in four different environments (Env.)
viz., high average temperature and high soil moisture (Env.
1), mild temperature and low soil moisture (Env.2), mild
temperature and high soil moisture (Env. 3) and low average
temperature and low soil moisture (Env.4). The average per
cent hard seed in seed lots was 5.42, 28.7, 19.4 and 33.9
under Env.1, Env.2, Env.3 and Env.4, respectively. The H2
estimate of hardseededness under Env.1, Env.2, Env.3 and
Env.4 was 0.67, 0.97, 0.96 and 0.98, respectively. Decreasing
soil moisture, low temperature and delayed harvest
increased occurrence of per cent hard seed. The force
required in Texture Analysis Machine to break seeds
produced under Env.1 ranged from 9.23 to 33.31 Newton
while the same ranged from 39.51 to 71.53 Newton in seeds
produced under Env.4. The Scanning Electron Microscope
images indicated that the seeds produced under low
average temperature and soil moisture had a presence of
compact outer cell layer with low surface deposition and
depression on the seed coat of seeds produced in Env.1
and there is existence of loose cells and cracks in the seed
coat with high depression and surface deposition in the
seeds produced under Env.4. A lower heritability of 0.67 for
hardseededness in high temperature and soil moisture
condition suggested that the character is influenced by
stress conditions. Growing of genotypes under low
temperature and moisture condition is suggested for
screening of genotypes for hardseededness in mungbean.
Keywords: Mungbean, hardseededness, heritability, hardness breaking force, Scanning Electron Microscope
Year: 2019
Volume: 79
Issue: 1, Supplement
Article DOI: 10.31742/IJGPB.79S.1.9
Print ISSN: 0019-5200
Online ISSN: 0975-6906
Debashis Paul, S. K. Chakrabarty*, H. K. Dikshit, S. K. Jha, G. Chawla and Y. Singh info_circle
Download PDF
