The Physiological Effects of Cadmium on Seedlings and Detached Leaves of Rice

• Main Authors: Chen, Sheng Lee, 陳勝利
• Other Authors: Kao, Ching Huei
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/93697563310467086278

碩士 === 國立臺灣大學 === 農藝學系 === 82 === The aim of this thesis was to study the effects of cadmium on the growth of etiolated rice seedlings and on the changes of ethylene production, NH4+, proline and polyamine levels in leaf segments and roots of etiolated seedlings of rice. The possible role of ethylene production, NH4+, proline and polyamine in the growth inhibition induced by cadmium was investigated.The main results are outlined as follows: 1.Cadmium inhibited the growth of the root of rice seedlings. 2.Cadmium chloride was found to be less effective than cadmium sulfate in inhibiting root growth of rice seedlings. 3.Glutathione (reduced form), L- glutamic acid and L-cysteine were able to recover the growth inhibition of roots by cadmium chloride, whereas BSO, enhanced the growth inhibition of roots induced by cadmium chloride. 4.Cadmium chloride treatment reduced ethylene production of rice seedlings, increased proline level and ionically bound peroxidase activity in the roots of rice seedlings. 5.Ethylene production, proline level and ionically bound peroxid- ase activity in detached leaves were found to be promoted by cadmium chloride at low concentration under light condition. 6.Cadmium induced ethylene production was observed in detached leaves of Indica type rice, but not in those of Japonica type rice. 7.Cadmium inhibited ethylene production was reducted in detached leaves from heat shock seedlings. 8. Pretreatment of detached leaves with ABA, MJ and IAA prior cadmium stress caused reduction in ethylene production. 9. At high concentration, heavy metals were able to promote the accumulation of proline in deatched rice leaves.