e-ISSN 2231-8542
ISSN 1511-3701

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Effect of High Temperature and Light Intensity on Physiology and Morphology in Young Dipterocarpus alatus Roxb. Leaf

Anoma Dongsansuk, Netnapha Sumthonglang, Chortip Kantachot, Watanachai Lontom, Piyada Theerakulpisut and Naruemon Kawjumpa

Pertanika Journal of Tropical Agricultural Science, Volume 43, Issue 2, May 2020

Keywords: Climate change, Dipterocarpus species, gas exchange, photosynthetic pigment

Published on: 25 May 2020

Heat and high light intensity affected physiology and morphology of young Dipterocarpus alatus Roxb. leaf studied. D. alatus is a native forest tree and being extended to cultivation in the field as an economic crop. Nowadays, climate change due to increasing in temperature and light intensity can affect growth, morphological and photosynthetic traits in D. alatus. This research aimed to study the effects of high temperature and strong light intensity on physiology and morphology of the young D. alatus. The experiment was decided in CRD with 5 replications. The two-year-old D. alatus was treated with combination stress between temperature (at 35°C or 41°C) and light intensity (at 700 or 1800 µmol m-2s-1) for 7 days. Plant morphology, gas exchange, PSII efficiency and photosynthetic pigment contents were measured. Strong light intensity (1800 µmol m-2s-1) affected plant morphology by leaf burning and heat injury. However, high temperature (41°C) combined with strong irradiation enlarged leaf injury and also increased percentage of heat injury (3.01±0.81%; T41L1800) compared to control (0.07±0.00%; T35L700). In contrast, it reduced percentages of leaf angle (-8.77±2.82%) and leaf area (-1.04±0.38%). In addition, the combination stress influenced reduction of net photosynthetic rate and contents of Chl a+b and Chl a but unaffected Chl b and Car contents. Therefore, combined stress affected young D. alatus by damaging photosynthetic pigments such as Chl a and injured leaf tissue. This resulted in reduction in both of photosynthetic mechanism and D. alatus leaf growth. Thus, young D. alatus leaf (two-year-old) was susceptible to heat combined with excessive light.

ISSN 1511-3701

e-ISSN 2231-8542

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