鹽堿脅迫對(duì)不同種源酸棗生長(zhǎng)發(fā)育特性的影響及評(píng)價(jià)
[Abstract]:Soil salinization seriously affects the development of jujube industry in Xinjiang. As the rootstock of jujube, the salt-tolerance ability of jujube directly affects the growth and development of jujube. Plant height, stem diameter, biomass and other growth indicators under combined stress, physiological indicators such as malondialdehyde, proline, soluble protein, total soluble sugar in leaves and photosynthetic parameters of leaves were determined. The differences of Salt-tolerance of jujube seedlings from different provenances were analyzed by membership function method, and the physiological mechanism of salt-tolerant environment was explored. The main results are as follows: (1) Under salt stress, alkali stress and salt-alkali synergistic stress, with the increase of concentration, the germination rate, germination potential and germination index of jujube in various provenances gradually decreased, and the relative salt damage rate gradually increased. The salt-alkali tolerance limit concentration of jujube in Shaanxi, Hebei and Liaoning was 0.9%, while that in Shanxi was 0.9%. According to the comprehensive analysis of the salt-alkali tolerance of the four provenances, the salt stress and the salt-alkali stress were: Shanxi, Hebei, Liaoning, Shanxi, Hebei, Shanxi. (2) The plant height, stem diameter, root, stem and total biomass of the jujube were inhibited by the three treatments at seedling growth stage. Under salt stress, there was no significant difference in plant height and stem diameter between 0.3% and CK, but there was significant difference in plant height and stem diameter between 0.6%~0.9% and CK. The plant height, stem diameter and total biomass were 100.2 cm, 7.93 mm, 56.68 g/plant respectively. Under 0.3% alkali stress, the height of Shanxi jujube was 78.24 cm, the stem diameter and total biomass of Hebei jujube were 6.61 mm, 39.89 g/plant. Under 0.3% salt-alkali stress, the height of Shanxi jube was 79.89cm, and the stem diameter and total biomass of Hebei jujube were 7.10 mm, 40.16 g/plant. In general, alkali stress had the greatest inhibitory effect on the growth of jujube seedlings. (3) Under salt, alkali and salt-alkali stress, the MDA content, proline and soluble protein content in the leaves of jujube from different provenances increased with the extension of stress time and the increase of salt-alkali concentration. The content of soluble sugar and organic acid decreased first and then increased. With the increase of stress concentration, there was no significant difference in the concentration of osmotic adjustment substances between the early stage and the later stage. (4) Salt stress, alkali stress and salt-alkali stress inhibited photosynthesis, reduced chlorophyll a, chlorophyll b and total chlorophyll content of Zizyphus jujuba. Under alkali stress, chlorophyll content was lower than that under salt stress and salt-alkali stress. The reason may be attributed to stomatal factors; however, under 0.9% alkali stress, the Gs value of the leaves of the four provenances decreased and the Ci value increased. The reason may be caused by non-stomatal factors. The Tr value of jujube leaves decreased and the WUE value increased. (5) Through weighted comprehensive evaluation of seed germination index, seedling growth index, physiological index and photosynthetic parameters of four different provenances, the order of salt-alkali tolerance of jujube seedlings was obtained. The order of salt-alkali tolerance of jujube seedlings was as follows: Shanxi, Shanxi, Liaoning, Hebei Provenance. Strong force.
【學(xué)位授予單位】:塔里木大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:S665.1
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