鋁處理之水稻 (Oryza sativa L. cv. Taichung Native 1 and O. sativa L. cv. Tainung 67) 幼苗根生長明顯受到抑制，根組織內過氧化氫酶活性亦有增加。台農67號之水稻根部鋁處理後引發過氧化氫酶活性的增加，加強根部組織清除由鋁引起之過氧化氫的能力，同時合成較多木質素。台中在來一號水稻品系則在鋁處理後，過氧化氫酶增加量少，造成較多的過氧化氫之累積，並且生成的木質素較少，故台中在來一號水稻對於鋁耐受性較差。因此，推測台農67號之水稻對鋁耐受性較台中在來一號佳。

Aluminum-treated rice seeding (Oryza sativa L. cv. Taichung Native 1 and O. sativa L. cv. Tainung 67) showed significant inhibition in rice root growth, and an enhancement of POX activity. In Tainung 67 cultivar rice synthesizes more lignin in Al-treated tissue. Meanwhile, the decrease of H2O2 levels is accompanied with the enhancement of POX activity in Al-treated tissue. The increase in POX activity induced by Al might remove excess hydrogen peroxide serving a detoxifying role and synthesizing more lignin for protection. In Taichung native 1 cultivar, high amounts of H2O2 accumulated in Al-treated tissues could be due to the less amounts of POX induced by Al. In response to Al treatment, the Taichung native 1 cultivar synthesizes less lignin in comparison with that of Tainung 67, and is more Al-less tolerant. Therefore, the Tainung 67 cultivar is more tolerant to Al than Taichung native 1.

Chinese abstract ----------------------------------- I

English abstract ----------------------------------- II

Table of contents ------------------------------- III

List of figures ----------------------------------- IV

Introduction ------------------------------------- 1

Materials and Methods ------------------------ 7

Results -------------------------------------------12

Discussion ---------------------------------------15

References ---------------------------------------20

Figures -------------------------------------------28

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