Abstract
Influence of phenylureas (CPPU) and brassinosteriod (BR) along with GA (gibberellic acid) were studied on seedless grape vegetative characteristics like leaf number, leaf area and leaf dry matter. Growth regulators were sprayed on the vines either once (7 days after fruit set or 15 days after fruit set) or twice (7+15 days after fruit set). CPPU 2 ppm+BR 0.4 ppm+GA 25 ppm produced maximum number of leaves (18.78) while as untreated vines produced least leaf number (16.22) per shoot. Maximum leaf area (129.70 cm2) and dry matter content (26.51%) was obtained with higher CPPU (3 ppm) and BR (0.4 ppm) combination along with GA 25 ppm. Plant growth regulators whether naturally derived or synthetic are used to improve the productivity and quality of grapes. The relatively high value of grapes justifies more expensive inputs. A relatively small improvement in yield or fruit quality can justify the field application of a very costly product. Application of new generation growth regulators like brassinosteroids and phenylureas like CPPU have been reported to increase the leaf number as well as leaf area and dry matter thereby indirectly influencing the fruit yield and quality in grapes.
Highlights
In India diversity in climate, soil and manipulation of cultural practices helps to produce grapes throughout the year
Number of leaves per shoot was significantly influenced by growth regulator treatments and their interactions
Combination of CPPU 2 ppm + BR 0.4 ppm + GA 25 ppm (T5) recorded maximum number of leaves (18.78) per shoot which was at par with T3,T4, T7, T9 and T10
Summary
In India diversity in climate, soil and manipulation of cultural practices helps to produce grapes throughout the year. Purohit et al (1979) reported that leaf area of 3064 cm was optimum for bunch and berry development is ‘Anab-e-Shahi’. The best quality fruits were produced by maintaining 12-16 leaves per bunch in ‘Anab-e-Shahi’ grape (Patil and Nagpal, 1981). Brassinosteroids (BRs) are a class of polyhydroxysteroids that have been recognized as a sixth class of plant hormones These were first explored nearly forty years ago when Mitchell et al (1972) reported promotion in stem elongation and cell division by the treatment of organic extracts of rapeseed (Brassica napus) pollen. BRs have been shown to be involved in numerous plant processes like promotion of cell expansion and cell elongation synergism with auxin, play role in cell division and cell wall regeneration, promotion of vascular differentiation etc. Both CPPU and BRs act synergistically with GA in promotion of many cellular processes including cell division and enlargement
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
