Start Submission Become a Reviewer

Reading: PHOTOSYNTHETIC CHARACTERISTICS AND PRODUCTIVITY OF THE COCONUT PALM

Download

A- A+
dyslexia friendly

Articles

PHOTOSYNTHETIC CHARACTERISTICS AND PRODUCTIVITY OF THE COCONUT PALM

Authors:

C. JAYASEKARA ,

COCOS, LK
About C.
Coconut Research Institute, Lunuwila, Sri Lanka.
X close

N. P. A. D. NAINANAYAKE,

LK
About N. P. A. D.
Coconut Research Institute, Lunuwila, Sri Lanka.
X close

K. S. JAYASEKARA

LK
About K. S.
Coconut Research Institute, Lunuwila, Sri Lanka.
X close

Abstract

Among the tree crops in the tropics the coconut palm occupies an important
position as a food, oil, and fibre crop. Productivity of crop species depends on the
combined effect of their genetic constitution, climate, nutrition and other biotic
factors. To increase the productivity of the coconut palm it is necessary to have a
basic understanding of physiological processes such as assimilation of carbon and
growth in relation to climatic factors.
In-situ photosynthetic measurement of coconut seedlings using Li-COR 6500
portable photosynthesis system revealed that their maximum photosynthetic capacity
is attained at photosynthetic photon flux densities (PPFD) ranging from 1400-1700
u moles photons m'2 S"1. The rate of apparent photosynthesis (A) of the coconut
palm varies between 2-15 a moi C02 m"2 S"1 depending on leaf age, nutritional status
.and climatic factors. The rate of leaf respiration was closely similar in young and
older leaves ranging from - 2 to -1 fi mol C02m'2S"'. The measured light-use
efficiency of the coconut palm was found to be 1.2 g MJ"1 and the conversion
efficiency of solar energy was approximately 2.4%.
Water deficit is the major constraint causing wide fluctuations in photosynthesis.
Due to height of trees, the leaves in the canopy are exposed to a high wind velocity
as well as water and thermal stresses. As a result, under soil water deficit conditions
coconut palms reduce excessive water loss and gaseous exchange by mid-day closure
of stomata and maintain stomatal conductance at a lower level. However, the rate
of apparent photosynthesis and the ratio of intercellular to ambient partial pressure
of C 0 2 (P/PJ are not decreased proportionately with the stomatal conductance.
How to Cite: JAYASEKARA, C., NAINANAYAKE, N.P.A.D. & JAYASEKARA, K.S., (2010). PHOTOSYNTHETIC CHARACTERISTICS AND PRODUCTIVITY OF THE COCONUT PALM. COCOS. 11, pp.7–20. DOI: http://doi.org/10.4038/cocos.v11i0.2149
Published on 29 Jul 2010.
Peer Reviewed

Downloads

  • PDF (EN)

    comments powered by Disqus