Variation of draught tolerance of seedlings of Shorea curtisii from seed sources of contrasting elevations

Mohd Basri Hamzah, . and Dawami Basri, . (1987) Variation of draught tolerance of seedlings of Shorea curtisii from seed sources of contrasting elevations. [Proceedings Paper]

Shorea curtisii is the major timber species in the Hill Dipterocarp Forests of Malaysia occurring within an altitudinal belt on inland mountain systems. Seeds were collected from mature ridge stands at its maximum HE and minimum LE elevations at 600 m and 300 m a.s.l. respectively in Ulu Gombak Forest Reserve about 25 km east of Kuala Lumpur. Seedlings were raised under greenhouse condition at UPM in a potting mixture of1550forest top soil peat and river sand respectively 7:3:2 v/v. After four weeks they were graded and selected for drought-cycle treatment in a 2x2 factorial design n30 over an eight-week period. Growth of LE seedlings were superior in terms of height and leaf number but inferior in Relative Growth Rate and Net Assimilation Rate NAR irrespective of treatment. Interestingly NAR of HE seedlings were unaffected by draughting whereas LE seedlings recorded significant reduction. There were no differences in diameter growth dry weight and total leaf area due to seed source. HE seedlings appear to have better establishment capacity with a photosynthetic system relatively tolerant of drought. The possible relative adaptive advantage is discuss

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Abstract

Shorea curtisii is the major timber species in the Hill Dipterocarp Forests of Malaysia occurring within an altitudinal belt on inland mountain systems. Seeds were collected from mature ridge stands at its maximum HE and minimum LE elevations at 600 m and 300 m a.s.l. respectively in Ulu Gombak Forest Reserve about 25 km east of Kuala Lumpur. Seedlings were raised under greenhouse condition at UPM in a potting mixture of1550forest top soil peat and river sand respectively 7:3:2 v/v. After four weeks they were graded and selected for drought-cycle treatment in a 2x2 factorial design n30 over an eight-week period. Growth of LE seedlings were superior in terms of height and leaf number but inferior in Relative Growth Rate and Net Assimilation Rate NAR irrespective of treatment. Interestingly NAR of HE seedlings were unaffected by draughting whereas LE seedlings recorded significant reduction. There were no differences in diameter growth dry weight and total leaf area due to seed source. HE seedlings appear to have better establishment capacity with a photosynthetic system relatively tolerant of drought. The possible relative adaptive advantage is discuss

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Item Type:	Proceedings Paper
Additional Information:	2 ill.; 3 tables; 4 ref. Summary En
AGROVOC Term:	SHOREA
AGROVOC Term:	PLANTULAS
AGROVOC Term:	RESISTENCIA A LA SEQUIA
AGROVOC Term:	MALASIA PENINSULAR/ ASIMILACION
AGROVOC Term:	CRECIMIE
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:25
URI:	http://webagris.upm.edu.my/id/eprint/14566

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