Genetic variability in early ripening grape genotypes.
Ram Kumar , Shailendra Rajan , Negi, S. S. , Yadava, L. P.
Central Institute for Subtropical Horticulture, PO Kakori, Rehmankhera,
Lucknow - 227 107, India.
The phenotypic and genotypic coefficients of variability, heritability
along with genetic advance for yield and yield components of 14 early
maturing grape genotypes were studied. The differences among the
genotypes were highly significant (p=0.05) for all the characters
(except bunch length) studied. A wide range of variation was recorded
for bunch width, number of berry per bunch, 100-berry weight, 100-seed
weight, juice content, total soluble solids, reducing sugar, organic
acid content and berry yield. Based on the coefficient of variation,
broad sense heritability and expected genetic advance, it can be
concluded that berry yield, 100-berry weight, 100-seed weight and
organic acid content provides a greater scope for selection of superior
genotypes. Among the 14 genotypes, Flame seedless produced the highest
(17.6 t/h) berry yield; Cardinal registered highest (275.6 g) 100-berry
weight with high (6.5 g) 100-seed weight; and Pusa Navrang showed
highest organic acid content and 100-seed weight (6.7 g). The
characters studied are quantitatively inherited and non-additive
effects were detected with organic acid.
by the deficit irrigations significantly reduced leaf number, leaf area
index and dry matter accumulation (p<0.05). Water deficit also
reduced final fresh weight by 20 to 30% with comparison to the control.
Nitrogen recovery reached 218 kg N/ha at maturity compared to control,
while consistent reductions averaging 35 and 40% were observed under
I-80 and I-60, respectively. Nitrogen use efficiency (NUE) also
decreased markedly in the less irrigated treatments. |
