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| Effects of low temperature stress on seedling emergence and seedling growth of direct-seeding early rice |
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| DOI：10.16768/j.issn.1004-874X.2018.03.001 |
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| Abstract: |
| In order to explore the effect of low temperature stress from sowing to seedling growth of early
rice. With Zhongjiazao17 as material，the effects of low temperature and treatment time on the morphological and
physiological indexes of germination and seedling were studied. The results showed that the breaking rice seed was
more resistant to low temperature than the bud（ bud half length）. When the treatment temperature was below 10℃
and the treatment days was more than 2 days，the seedling emergence rate of the bud decreased more significantly
than the breaking rice seed with the temperature decreased and the time prolonged. The younger seedling，the
stronger the cold tolerance ability，when the temperature dropped to 6℃，seedlings would basically stop growing.
Under the influence of low temperature，the MDA content of plant on the ground increased gradually with the increase
of seedling age，the lower the temperature，the more obvious change. The proline content decreased gradually with the
increase of seedling age，seedling age was smaller，the higher the content of proline. Therefore，under the condition
of low temperature stress，germination degree of the bud was more sensitive to low temperature，the large seedling
age was more sensitive to the small seedling age. This paper would provide reference for guidance to the direct seeding
production of double season early rice. |
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