| Plant could Change their morphological structure as a adaptation strategie to responsed the environmental change. Ziziphus jujuba var. Spinosa are distributed from east to west of our country. The morphological structure same of plants were changed in the long-term adapt to different habitats. In a certain extent whether the change could be inherited stably, which uesed for give an explanation of the plant local adaptive strategies. We also can inference the suitable countermeasure and evolutionary mechanism of the plant. In order to explore the different changes of the jujuba whether could transmitted stability,our research collected four natural gradient jujuba seed from four dry habitats the of Yantai, Zanhuang, Yinchuan and Turpan, through the potted water control method for our drought stress experiment, study different provenances jujuba seedlings morphology, structure response to drought stress, and contrast of jujuba situ, explore its shape, structure with natural gradient adaptation arid environment if stable genetic drought, the plants adapt to global climate prediction is becoming dry the evolution of the foundation, results were as follows:(1)The analysis of Jujuba leaf morphology showed that: The jujuba leaf morphology changed regularly with the drought stress. Under drought stress conditions, from Yantai to Turpan four kinds of sources of seedlings, leaf length,leaf width, leaf area, leaf perimeter, showed a decreasing trend long spines; leaf length / leaf width, from Yantai to Turpan and every in the ground, with the drought enhancement rise. Jujuba plant has a long thorn with changes in the environment are quite different from Yantai to Turpan, the plants tend to elongate length of thorn; within plots, along with enhanced aridity, jujuba plant thorn length decreases, the density increases; from Yantai to Turpan, leaf length / leaf width tended to increase, with the drought enhancement of jujuba blade tends to elongate.(2)The analysis of Jujuba Stem morphology showed that : jujuba base stem diameter, length of secondary branches, crown, crown height, stem density ratio, and number of secondary branches jujuba shares from Yantai to Turpan,were tested with enhanced drought stress reduction small trend. Probably because of drought degree of enhancement, plant nutrition and moisture conditions are restricted, slow metabolism, plant conservative growth strategy.(3)The analysis of the Jujuba plant leaf anatomical structure results showed that: jujuba leaf bifacial leaf, the upper and lower epidermis and are distributed in bulk or sheet waxy cuticle layer, a small amount of green veins at the table fur,developed palisade tissue, closely spaced elongated cylindrical, spongy tissue degradation. When there is no drought stress, the Yantai area jujube leaf lower epidermis thickness, the thickness of the bundle sheath cells, a relatively small total thickness of the blade and palisade tissue thickness of the largest in the Turpan area; drought stress on four provenances jujuba, under cuticle thickness,palisade tissue thickness and CTR(palisade tissue thickness / leaf thickness)value showed an upward trend. Jujuba leaf reinforced with the drought, there is a change from the bifacial leaf to leaf surfaces and other signs.(4)The analysis of the Jujuba Stem crosscutting structural results showed that:jujuba primary structure of stem consists of epidermis, cortex and stele(also known as vascular cylinder) of three parts. Stem leather table cuticle, a large number of students stems thorn distributed pores. Cortex by a large number of thin-walled cells, cell morphology diversity, distribution secretion chamber,secretory cells, mucus Road and crystals. From Yantai to Turpan, not drought stress, the secretion of cell diameter, the thickness of the cortex, medullary area are the greatest in the Turpan area Yantai area jujuba minimum. After drought stress, within plots ALLEY epidermis thickness, pipe diameter and number of secretory cells uptrend, at 5% of the amount of water to the indicators Turpan area jujube maximum.(5)The analysis of the jujuba plant root crosscutting structural results showed that: root plants absorb water, fixing the major organs of nutrients. Jujuba root primary structure including epidermis, cortex and stele(vascular cylinder).When there is no drought stress, from Yantai to Turpan, root epidermis thickness of the primary structure, the thickness of the cortical parenchyma cells and vascular cylinder area, increased first decreased and then increased trend of Yantai was the largest, followed by Turpan; after drought stress, from Yantai to Turpan, vascular cylinder area tended to increase, the largest in Turpan; except column thick sheath cells continues to increase, the rest of the characters were tested first decreased and then increased trend.(6)The Scanning electron microscope of jujuba plant leaf epidermis micro environment analysis showed that: from Yantai to Turpan, a jujuba leaf, under the cuticle, trichomes blade length and density, length jujuba leaf stomatal guard cell thickness, stomata length to diameter ratio are tended to increase,pore minor axis decreases overall; drought stress, traits variation of Four sources jujuba seedlings versa. After drought stress, jujuba blade wax layer and dorsal trichomes increase after the increase, some leaf stomata appear subsidence phenomenon. |
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