Malaya. Appl. Biol. (1998) 27(1 & 2): 73-76
GAS EXCHANGE CHARACTERISTICS AND LEAF CHLOROPHYLL CONTENT OF TWO LOCAL HOSTS INFECTED BY JARUM MAS (STRIGA ASIATICA)
M.F. RAMLAN, M.T.M. MOHAMED and S.A. HASSAN
Department of Agronomy and Horticulture, Universiti Putra Malaysia 43400 UPM Serdang, Selangor, Malaysia
ABSTRACT
The effect of Jarum Mas (Striga asiatica), a parasite, on the gas exchange capacity and leaf chlorophyll content of two local grasses was studied. Infection by S. asiatica reduced the host photosynthetic capacity by reducing the apparenl quantum yield used for CO, fixation. In Ischaemum indicum, lower photosynthesis rates were also due to the reduction of RuBP-carboxylase capacity and the RuBP-carboxylase regeneration capacity of the host.
ABSTRAK
Kesan jangkitan parasit Jarum Mas (Striga asiatica) ke atas kadar pertukaran gas dan kandungan klorofll daun terhadap dua rumput perumah telah dikaji. Jangkitan S. asiatica ini menyebabkan penurunan keupayaan fotosintesis perumah menerusi pengurangan hasil kuantum ketara yang digunakan bagi pengikatan CO,. Pada perumah Ischaemum indicum, penurunan kadar fotosintesis juga disebabkan oleh pengurangan kapasiti RuBP-carboxylase dan kapasiti regenerasi RuBP-carboxylase perumah.
Key words: Parasites, quantum yield, regeneration capacity, RuBP capacity
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