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Grafting influence on productivity and drought tolerance of tea clones

Published online by Cambridge University Press:  28 August 2019

R. Karunakaran Open the ORCID record for R. Karunakaran [Opens in a new window]  and
R. V. J. Ilango
R. Karunakaran*
Affiliation:
Botany and Plant Improvement Division, UPASI Tea Research Foundation, Nirar Dam PO, Valparai-642 127, Coimbatore, Tamil Nadu, India Institute of Plant Sciences, Gilat Research Center, Agricultural Research Organization, Bet-Dagan, Israel
R. V. J. Ilango
Affiliation:
Botany and Plant Improvement Division, UPASI Tea Research Foundation, Nirar Dam PO, Valparai-642 127, Coimbatore, Tamil Nadu, India
*
Author for correspondence: R. Karunakaran, E-mail: [email protected]
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Abstract

Grafting of fresh cuttings using drought-susceptible and low-yielding clones as scions on drought-tolerant clones as rootstocks offers the possibility of raising composite plants with improved productivity and drought tolerance. Hence, the study was aimed to widen the choice of compatible composites and to delineate the underlying factors responsible for productivity and drought tolerance in grafted plants. One year-old composite plants of TRF-1, TRF-2 and UPASI-28 cleft-grafted on the rootstocks of UPASI-2, UPASI-9, ATK-1 and TRI-2025 were field planted along with their respective controls and evaluated. The results indicated that productivity and drought tolerance of scion clones varied significantly with the rootstocks used. Significant increases in yield and yield components were noted in the following graft combinations compared with their corresponding self-rooted scion clones: TRF-1 grafted on UPASI-9 and ATK-1, TRF-2 grafted on all four rootstocks, and UPASI-28 grafted on UPASI-9, TRI-2025 and UPASI-2. The findings clearly emphasize the scion–rootstock interaction as the critical determinant of productivity in grafted plants compared with vigour, drought tolerance and yield potential of scion and rootstock clones. Further, high-yielding capacity of grafts over the ungrafted scions and rootstocks was largely dependent on the yield potential of the scion clone and the degree of scion–rootstock compatibility. Higher field survival and enhanced yield observed during the drought period in the compatible grafts demonstrated their better drought tolerance compared with their respective self-rooted scions.

Keywords

Cleft-graftinggraft compatibilityrootstocktea clones
Type
Crops and Soils Research Paper
Information
The Journal of Agricultural Science , Volume 157 , Issue 3 , April 2019 , pp. 217 - 225
Copyright
Copyright © Cambridge University Press 2019 

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