Salt tolerant rootstocks for increasing quality production of mango (Mangifera indica L.)
Gutam, Sridhar; Singh, V K and Ravishankar, H (2011) Salt tolerant rootstocks for increasing quality production of mango (Mangifera indica L.). In: Swadesh Prem Jagriti Sangosthi 2011: National Conference on Horti Bisiness – Linking Farmers with Market, 28-31 May 2011, Dehradun, Uttarakhand.
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The four year data (2006-2010) from the National Horticulture Board (NHB) shows that there is a stagnation in the area and production of king of the fruits, mango (Mangifera indica L.) with an average productivity of 6 t/ha. To improve the productivity, the production from the existing area needs to be increased and at the same time, new areas also need to be brought under cultivation. For this, new plantings need to come up on wide variety of soils under different agro-climatic conditions. In India, soil salinity is becoming a major problem and nearly 6.73 million hectares of area is under salt affected soils of which, 2.7 million hectares is under Indo-Gangetic plains comprising of Punjab, Haryana, Uttar Pradesh and part of Bihar, West Bengal and Rajasthan. Salinity is a serious limitation for bringing large geographical areas under mango. In addition to this, use of poor quality irrigation water also causes salt stress to the crop. The mango is very sensitive to salinity particularly at early stages of growth. Polyembryonic mango genotypes (e.g. Kurakkan) are reported to have salt tolerance and the salt tolerance level of genotypes is also variable. The mango variety '13-1' is a promising salt tolerant rootstock from Israel where the average productivity is 30-35 t/ha is being introduced into Haryana under the Indo-Israel project. Therefore, salt tolerant rootstocks need to be identified for increasing the area, production and productivity of mango. Germination percentage, number of leaves, leaf area, plant height, root length, number of secondary roots and root fresh & dry weight, root:shoot ratio, accumulation of sodium & chloride ions, Na:K ratio in roots & leaves, chlorophyll 'a' and 'b' content, pigment degradation and chlorophyll a fluorescence are some of the indices, which could be candidate to screen the salt tolerant mango rootstocks.
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