The two month old seedlings of 15 families of Casuarina equisetifolia were treated with different concentrations of polyethylene glycol-6000(PEG-6000) to study the changes of malondialdehyde (MDA), superoxide dismutase (SOD) activity and proline content. Results indicated that MDA content of seedling leaves of each family increased with the increase of stress intensity after drought stress treatment, but the increase rate of each family was quite different. The SOD activity of each family was different under different drought stress levels, and showed different capacity response to drought resistance. With the severe stress treatment, except the Yue-hybrid, the proline content of other families increased significantly compared with control. The comprehensive evaluation of drought resistance by principal component analysis showed that MDA content was the most important index reflecting water stress. Based on comprehensive analysis, the drought-resistance of 701, Pu2, Kang3, Hui2, Nanshan7, Dongshan2 were strong, the drought-resistance of Dongshanduan, 601, 59, A13 were middle, but the drought-resistance of Yue-hybrid, Kang1, Long4, Ping5 were weak.
LU Ya-li
,
WU Yang-xi
,
CHEN Hong-yue
. Variation of Physiological Indices of Casuarina equisetifolia Seedlings under PEG Simulated Drought Conditions[J]. Subtropical Plant Science, 2019
, 48(02)
: 109
-113
.
DOI: 10.3969/j.issn.1009-7791.2019.02.002
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