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EFFECT OF N, K, CI ON PHOTOSYNTHESIS AND WATER RELATIONS OF OPEN POLLINATED TALL (typica) COCONUT SEEDLINGS

Authors:

C. JAYASEKARA ,

LK
About C.
Coconut Research Institute of Sri Lanka.
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R. G. MUDALIGE,

LK
About R. G.
Coconut Research Institute of Sri Lanka.
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C. S. RANASINGHE

LK
About C. S.
Coconut Research Institute of Sri Lanka.
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Abstract

CO2 assimilation and plant water status were measured in sand-culture-grown amputated
coconut seedlings treated with three levels ofN, K, and CI and subjected to different soil water
deficit conditions. Application of increased levels of N and K enhanced the assimilation of C02
while individual and combined effects of N,K, and CI improved the water economy of coconut
seedlings. Under the soil water deficit conditions, adequate supply o fN helped to maintain high
leaf water potential by the accumulation of solutes like proline and sugars. Whereas, adequate
supply of K and Cl themselves acted as osmotica by increased accumulation of these nutrients in
leaf tissues, although other solute concentrations such as those of sugars and proline were reduced.
Our data show that maintenance of sufficient levels of N and K contribute to the growth of the
coconut seedling through improved gaseous exchange, CO2 assimilation and better partitioning
of assimilated carbon into shoot and roots, potassium and C1 are further important for maintenance
of water status of coconut seedlings by improved stomatal regulation, water uptake and osmotic
adjustment of tissues under water deficit conditions.
How to Cite: JAYASEKARA, C., MUDALIGE, R.G. & RANASINGHE, C.S., (2010). EFFECT OF N, K, CI ON PHOTOSYNTHESIS AND WATER RELATIONS OF OPEN POLLINATED TALL (typica) COCONUT SEEDLINGS. COCOS. 9, pp.30–39. DOI: http://doi.org/10.4038/cocos.v9i0.2127
Published on 27 Jul 2010.
Peer Reviewed

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