Vol. 10, Issue 11 (2021)

Author(s):
P Vijay kumar, J Auxcilia, MS Aneesa Rani and KB Sujatha

Abstract:
Carica papaya Linn. Belongs to the family caricaceae and TNAU Papaya CO.8 is a dioecious, red fleshed variety with high yield and well suitable for tropical conditions and propagated through seeds. The main constraint in production is, it is dioecious in nature i.e. produces male (staminate) and female (pistillate) plants separately. Hence, grafting technology has been standardized to produce separate male and female plants for easy propagation. Though the success rate of grafts was reported to be more than 80 per cent, at times during unfavorable climatic conditions the failure in graft union occurs. Hence, in the present study GC-MS analysis was done to find out the secondary metabolites associated with the successful grafts compared to the unsuccessful grafts. The GC-MS analysis revealed that trifluoroacetoxy pentadecanal, benzoyl-2-hydroxyadamantane (Vildagliptin), styrene, Nonanal, dodecane, cyclopentylpropionic acid, tetradecane, hexdecane, hexdecanoic acid, octadecanedioic acid, pentatriacontene, tetradecynoic acid, vaccenic acid, squalene and isopropyl linoleate were the compounds present in successful grafts. Among the 15 compounds, six compounds viz., tetradecane, dodecane, styrene, hexadecane, hexadecanoic acid and nonanal were reported to possess plant growth promoting activity, which might have contributed for the successful graft union. Also organic compounds like lipid and lipid like compounds were higher in the successful grafts. Benzenoids indicated a negative impact on the graft union. This compound was observed to be present in higher amount in the unsuccessful grafts as compared to successful grafts that might have hindered graft union. A detailed study of the mode and mechanism of action of these compounds will give a clear understanding of their involvement in graft union.