Malaysian Applied Biology Journal

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Malays. Appl. Biol. (2005) 34(1): 47-52

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Malays. Appl. Biol. (2005) 34(1): 47-52

DIFFERENTIAL RESPONSES OF LEAF GROWTH AND

STOMATAL CONDUCTANCE OF FLOODED CAPSICUM ANNUUM

CULTIVARS AND ITS RELATIONS WITH XYLEM SAP ABA

MOHD. RAZI, I.

Department of Crop Science,

Universiti Putra Malaysia,

43400 UPM Serdang, Selangor

ABSTRACT

The effects of soil flooding on leaf growth, water relations, stomata responses and xylem sap abscisic acid (ABA) were investigated on two pepper cultivars, c.v Bell Boy and AVRDC148. Early reduction in leaf growth and stomatal conductance was in the absence of leaf water deficit. These early reduction in plant responses are not associated with the xylem sap ABA in both cultivars studied. Higher concentration of xylem sap ABA was found in flood sensitive Bell Boy than the tolerant AVRDC 148 cultivar. The differential responses may be attributed to the ability of AVRDC 148 to maintain plant water status when subjected to prolonged soil flooding compared to Bell Boy. The study suggests that the reduction in leaf expansion and stomatal conductance in pepper cultivars are limited by other root chemical signals other than ABA within the plants.

ABSTRAK

Pengaruh banjir terhadap perkembangan daun, kaitan air, respon stomata dan absisik asid (ABA) dalam sap xilem telah dikaji keatas dua kultivar cili, Bell Boy dan AVRDC 148. Pengurangan awal pengaruh tanamn tidak berkaitan dengan perubahan ABA dalam xilem dalam kedua-dua kultivar yang dikaji. Kepekatan ABA adalah tinggi dalam sap xilem kultivar Bell Boy yang sensitif di bandingkan dengan AVRDC 148 yang tahan kepada banjir. Pengaruh berbeza ini mungkin dihasilkan oleh keupayaan AVRDC 148 mengekalkan status air tanaman apabila didedahkan kepada kesan banjir yang berpanjangan dibandingkan dengan Bell Boy. Kajian ini mencadangkan pengurangan kepada perkembangan daun dan kekonduksian stomata dalam kultivar cili dihalang oleh bahan kimia yang terangsang oleh akar selain dad ABA yang terdapat dalam tumbuhan.

Key words: xylem sap ABA, pepper cultivar, flooding; water relations

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