Role of sucrose catabolising enzymes associated with fibre elongation in hybrid and parental lines of cotton

摘要

Role of sucrose catabolising enzymes viz. acid invertase, neutral invertase and sucrose synthase (in the cleavage direction) in relation to soluble sugars were studied in hybrid and its parental lines of cotton. Higher activities of soluble acid invertase, sucrose synthase and low sugars in intra-hirsutum hybrid (Fateh) indicates the faster metabolic state during the elongation phase of fibre growth. Fibre elongation may probably be requiring more glucose and fructose for its onward utilization to generate carbon for primary wall formation. In general, acid invertase was the pre-dominant sucrose hydrolyzing enzyme followed by sucrose synthase in hybrid and its parental lines. On the whole, total free sugars declines during the entire growth and development period of fibre formation. Parental lines had higher amount of both reducing and non-reducing sugars than the hybrid. The probable role of sucrose hydrolysing/ catabolising enzymes in relation to fibre elongation in hybrid and parental lines hasbeen discussed.