STUDIES ON SEED DEVELOPMENT, EXTENT OF HARDSEEDEDNESS AND ITS MITIGATION IN KASURI METHI [Trigonella corniculata (L.) L.]
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Date
2019
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DIVISION OF SEED SCIENCE AND TECHNOLOGY ICAR-INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI
Abstract
Kasuri methi (Trigonella corniculata (L.) L.) is an important multiuse seed
spice crop of India. Kasuri methi seeds fails to germinate immediately after harvest under
natural conditions due to hardseededness. Extent of hardseededness varies in different
species of Trigonella which leads to dormancy and ultimately poor field emergence and
crop stand. The present investigation was undertaken with three varieties of Trigonella
corniculata cv. Pusa Kasuri, Kasuri Supreme and Anand Selection-1. The
hardseededness ranged from 40.0 to 54.7% in these varieties. To investigate development
of hardseededness the above varieties i.e. Pusa Kasuri, Kasuri Supreme and Anand
Selection-1were sown during rabi, 2018 and flowers were tagged 3days after anthesis
(DAA) and pods were harvested at 17, 20, 23, 26, 29, 32, 35, 38 days after anthesis
(DAA) and tested for seed germination and hard seed percentage. No germination was
observed until 20 DAA in Pusa Kasuri and Anand Selection-1 whereas in Kasuri
Supreme seed germination of 11.44% was observed. All varieties reached physiological
maturity at 29 DAA where maximum seed germination was recorded. Further
advancement towards seed maturity increased hardseededness and maximum hard seeds
were observed at 38 DAA. To study the extent of hardseededness, fresh seeds of above
varieties were stored in cloth bags under ambient conditions for six months. Extent of
hardseededness was high immediately after harvest which declined during storage. Hard seeds
ranged from 45-55% in these varieties of Kasuri methi in fresh seeds which declined
gradually during storage (33-42%). Standardisation of dormancy breaking treatments was
done to mitigate the hard seed coat induced dormancy. Based on seed germination results,
freeze (4 days)-thaw (room temperature) method, sand paper scarification (50 grit for 5
min) and conc. sulphuric acid scarification (5min) were found most effective for breaking
seed dormancy in kasuri methi. The study concluded that fresh seeds of kasuri methi had
dormancy due to hardseedednesss which was released gradually during storage.
Dormancy breaking treatments, freeze (4 days)-thaw (room temperature) method, sand
paper scarification (50 grit for 5 min) and sulphuric acid scarification (conc. sulphuric
acid for 5min) were effective in relieving the dormancy and promoting germination in
kasuri methi.
Keywords: STUDIES ON SEED DEVELOPMENT IN KASURI METHI (Trigonella corniculata (L.) L.),
STUDIES ON EXTENT OF HARDSEEDEDNESS IN KASURI METHI (Trigonella corniculata (L.) L.),
STUDIES ON MITIGATION IN KASURI METHI (Trigonella corniculata (L.) L.), STUDIES ON
GERMINATION OF NEWLY HARVESTED SEEDS OF KASURI METHI (Trigonella corniculata (L.)
Description
T-10264
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