MEKANISME FISIOLOGI TOLERANSI TERHADAP CEKAMAN ALUMINIUM PADA SPESIES LEGUM PENUTUP TANAH

Utama , M. Zulman Harja and Zen , Yusrizal M. and Haryoko , Widodo (2010) MEKANISME FISIOLOGI TOLERANSI TERHADAP CEKAMAN ALUMINIUM PADA SPESIES LEGUM PENUTUP TANAH. jurnal stigma, 12 (2). ISSN 0853-3776

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Abstract

Aluminum ion (Al3+) is toxic to plants at micro molar concentrations. Al toxicity has been known as major limiting factor for crop productivity on acid soil. The primary effect of Al toxicity is a rapid inhibition of root elongation due to detrimental effect on the targeting site of Al toxicity, the root apex. The research was aimed to study the physiological tolerance mechanism of legume cover crop species to Al stress. Two of two factor factorial experiments were conducted, each using a randomized complete design with three replications. First factor was 2 species of legume cover crops and second factor was level of aluminum on the growth media. The result show that the tolerant species, Pueraria javanica had a better ability than the less tolerant Calopogonium ceurelium, to detoxify Al ion through a higher production of secreted organic acids to the growth media as the external mechanism and accumulation of the acid in the root as the internal mechanism. The organic acids reduce the Al activity through chelating process. Three most important chelating agents were citric, malice, and oxalic acid. Key words : Mechanism physiological, tolerance, alumi-nium, legume, organic acid

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