Jayashree et al MJAS 2022

560
Mysore J. Agric. Sci., S6 (2): 161-165 (2022)
Effect of Gamma Irradiation on Germination and Survival of Seedlings in
Papaya Cv. Arka Prabhath
M. J. JavASHREE', M. MANAMOHAN AND VaGEESHBABU S. HANUR
Department of Plant
-
Biotechnology, University of Agricultural Sciences, GKVK, Bengaluru
2'Indian Institute of Horticultural Research, Bengaluru - 560 065
e-Mail vageeshbabu.hs@icar.gov.in
06
ABSTRACT
Fruit quality improvement is one of the aims to reach in papaya breeding. In the present investigation the papaya cv.
Arka Prabhath an advanced generation gynodioecious cultvar developed at HR-Bengaluru was subjected for
gamma iadiation with differet doses viz, 0Gy. 50 Gy, 100 Gy, 1s0 Gy and 250 Gy to study treatment influence mainly
on shelf life parameter of fruits. Germination percentage of check variety was recorded as 89.75 per cent in red lady
and 81.25 per cent in control Arka Prabhath followed by gamma treated M, progenies 74.37 per cent (100 Gy), 63.75
per cent (150 Gy) and 50.62 per cent (50 Gy) where, least percentage recorded by 250 Gy treated seeds (5.625%).
Survival percentage in nursery was 88 per cent in red lady, 75.63 per cent in control Arka Prabhath followed by 47.5
per cent (100 Gy), 45 per cent (50 Gy), 36.87 per cent (150 Gy) and 3.75 per cent (250 Gy). Survival percentage in the
field was 62 per cent in check variety red lady, control Arka Prabhath (75%%), followed by 46.25 per cent (100 Gy), 43.75
per cent (50 Gy) and 31.87 per cent (150 Gy) whereas, 250 Gy treated seeds did not survive. Along with the M
population, M, population of selected 20 (19+1 control) mutant lines with prominent characters from M, population
were also carried forward for the experiment. M, population occupied 179 plants in the field. Seed viability was also
checked using Tz (tetrazolium test) for irradiated seeds.
Keywords: Gamma irradiation, Germination, Papaya
To
The
Christopher 'fruit of the angels',
Columbus, adored by
apparently translated the
an early adopter
Carb name 'ababi' (Anonymous, 2021). A 'common
man's fruit', papaya is also known as melon tree or
papita (Roshan, 2021) gives insight into exquisite
Teatures. Papaya (Carica papaya L.) belongs to the
lamily Caricaceae, is one of the
most economically
mportant fruit crops due to its high nutritive value and
productivity, varied medicinal and industrial uses.
Unripe green papaya is also used as vegetable,
contain all other nutrients except carotene
Vjayalakshmi and Nagaraju, 2017). Fiber-rich fruit
ds ts origins in South Mexico and/or in Central
America (Ming and Moore, 2014) and it has great
apacity of adaptation to the conditions of subtropical
dnd tropical regions of the world.
Itis a diploid species with a small genome of 372 Mbp/
1C
ganathan and Earle, 1991) and nine pairs
(Arumugar
nromosomes (Bennett and Leitch, 2005). Papaya
aiso the main source of papain, a cysteine protease,
enzyme widely used in meat industry for tenderization
of tough meat.
Papaya production and productivity has several
obstacles like, diseases, pests and post harvest losses.
Among them diseases like, anthracnose, powdery
mildew, black spot, brown spot and papaya ring spot
(Shantamma and Mantur, 2014) are more severe
reasons.
Fruit shelf life improvement is one of the aims to reach
in papaya breeding besides good yield, tolerance or
resistance for PRSV. Mutation breeding has been an
alternative technique preferred by breeders as it allows
e possibility to form characteristics that do not exist
in the nature or lost throughout the evolution. Mutation
breeding can be enhanced by genetic selection for
novel alleles. Present investigation has an objective to
reach such as, to develop Mx (M,, M,) TILLING
populations of papaya Cv. Arka Prabhath. Therefore
analysis of germination percentages and survival
percentages are crucial.
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