STUDIES ON EFFECT OF GAMMA IRRADIATIONS FOR INDUCING VARIABILITY IN GLADIOLUS (Gladiolus grandiflorus L.)
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Date
2019-12-23
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K.R.C COLLEGE OF HORTICULTURE, ARABHAVI (UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT)
Abstract
The present investigation on "Studies on effect of gamma irradiations for inducing variability in gladiolus (gladiolus grandiflorus l.)" was carried out at Department of FLA, KRCCH, Arabhavi, Gokak taluk, Belgaum district, Karnataka during the year 2018-2019. Experiment was laid out in FRCBD with 7 treatments combination with an aim to identify the best gamma irradiation doses on growth, flowering and corm parameters in two cultivars viz., White Prosperity (V1) and Hosur Local (V2).
Among interaction effects of different gamma irradiation doses and two cultivars, T1V1 (1.5 kR+ White Prosperity) recorded maximum sprouting per cent (100), plant height at 75 DAP (73.50 and 70.74 cm), leaf length (56.86 and 54.85 cm), leaf area (227.40 and 242.86 cm2), minimum days taken to spike initiation (57.86 and 59.57 days), minimum days taken to first floret opening (67.46 and 68.39 days), maximum spike length (65.90 and 63.71 cm), rachis length (47.36 and 48.57 cm), number of florets per spike (18.40 and 17.38), florets diameter (11.17 and 10.21 cm), vase life (9.60 and 9.30 days) and diameter of corms (5.93 and 5.70 cm). Whereas, T1V2 (1.5 kR + Hosur Local) recorded minimum number of days to sprouting (7.80 and 9.75 days), maximum sprouts per corm (2.70 and 2.38), number of leaves (15.75 and 14.21), number of spikes per plant (3.33 and 2.65), number of corms (5.47 and 4.84), number of cormels (34.87 and 31.27), weight of corms (100.13 and 95.93 g) and weight of cormels (16.50 and 15.18 g) during both generations respectively. However, treatment control had shown better results over other treatments as it was not treated by gamma irradiation doses.
Lower doses of gamma irradiations viz., 1.5kR (T1) and 2.5kR (T2) of gamma rays can be used for crop improvement as a stable mutant was isolated in cv. Hosur Local having white dots all over the flowers when treated with 2.5kR (T2) of gamma rays which can be successfully employed for further crop improvement studies.
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