TITLE:
Gamma Ray Induced Radio Sensitivity in Three Different Mulberry (Morus) Genotypes
AUTHORS:
Hyadalu Lingappa Ramesh, Veerapura Narayanappa Yogananda Murthy, Munirajappa
KEYWORDS:
M5; S54; Kosen; Gamma; Sprouting; Rooting; Survivability; Plant Height; Leaf Area
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.4 No.7,
July
5,
2013
ABSTRACT:
Mulberry genotypes M5,
S54 and Kosen were procured from mulberry germplasm bank, Department
of Sericulture, Bangalore
University. Juvenile
twigs of mulberry genotypes were used for cuttings preparation. Newly prepared
juvenile cuttings were irradiated with different doses of gamma rays (1 kR - 10 kR) from Co60 gamma unit.
Propagation parameters like sprouting, rooting, survivability, plant height,
number of branches, internodal distance and leaf area were recorded. Results
revealed decline in growth parameters with the increase in gamma ray dosage (1 kR - 10 kR). Moderate dosages (4 kR - 7 kR) are the most competent range and
height of the irradiated population significantly reduced with the increase in
gamma rays dosage. Higher doses of gamma rays (8 kR - 10 kR) drastically reduced the number of
branches. M5 and S54 showed marked improvement in plant
height at 4 kR (155.14 cm)
and 7 kR (147.86 cms) respectively compared to
control. Morphologically, leaf mutants like enlarged (4 kR), curled (8 kR), mosaic (8kR) and biforked (9 kR) leaves were observed in gamma
irradiated M5 genotype. Kosen exhibited small, crumpled, biforked
and chlorophyll deficient leaves (8 kR - 10 kR). S54 exhibited boat
shaped leaves with wrinkled texture (8 kR).