|
The bamboo genus Poaceae (Gramineae) bamboo subfamily (Bambusoideae), perennials, mainly distributed in the warm and humid tropical and subtropical regions, and in China are mainly distributed in the regions south of the Yangtze River basin. Bamboo as an important class of landscape green plants, play a significant role in the city's ecological environment construction and beautification. In the south, the bamboo as the application of more types of urban landscape trees and shrubs, but less application of bamboo species in the northern city, mainly because of the northern climate than drought, water is the main limiting factor for growth of bamboo in the north. Can bamboo plants better applied to the northern city of landscaping, to the yellow stripe Diamond bamboo (Pleioblastus kongosanensis f., Aureostratus Muroi et Y. Tanaka (e)), the Philippines and white bamboo (Sasa fortunei in the (Van Houtte) Nakai) Philippine Wong Chuk (Sasa auricoma E. G Camus), paving bamboo (Sasa argenteostriatus Camus) 4 Ornamental bamboo material, the potted water control methods, research under persistent drought stress Four Ornamental Bamboo morphology and physiological and biochemical indicators of change in response to the situation, to explore Four Ornamental Bamboo drought mechanism on 4 bamboo comprehensive evaluation of drought resistance, drought resistance of bamboo species screened, by ornamental bamboo in landscaping The application provides the theoretical basis given. The main conclusions emerging from the study are as follows: (1) drought stress 4 farming the ornamental bamboo morphological changes in the persistent drought stress, 4 farming ornamental bamboo morphological changes quite different, reflected in the leaf yellowing, leaf curl, different levels of plant wilted. Test 3d 4 bamboo species occasionally leafroll 6d serious when leafroll flooring bamboo tip withered phenomenon appears, test 12d when the yellow stripe Diamond Leaf to curl, but the leaves remain green, the Philippine Wong Chuk leaves curl old leaves dry chlorosis, a few yellow leaves dry in the Philippines and white bamboo flooring bamboo the whole plant sticks, leaves, yellow, almost no leaves recoverable. Judged from the morphology farming ornamental bamboo drought resistance in descending order: the yellow stripe Diamond Bamboo gt; Philippine white bamboo gt; Philippine Wong Chuk gt; paving bamboo. (2) drought stress under Four Ornamental Bamboo physiological and biochemical indicators of different physiological and biochemical indicators of changes in the curve of the same, with the duration of stress time, in response to the situation during drought stress, leaf water content, chlorophyll content of Drought The gradual decline in the conduct of the cell membrane relative permeability, malondialdehyde (MDA), proline With the intensification of drought stress on the rise, soluble sugar, soluble protein and peroxidase (POD), superoxide dismutase (SOD), catalase (CAT) activity performance is increased at first and then a downward trend. Compared with Od controlled, sustained drought stress the 12d when the yellow stripe Diamond Bamboo, the Philippines and white bamboo Philippine Wong Chuk and paving bamboo leaf water content decreased by 3.95%, 5.37%, 9.86%, 67.90%; cells permeablility the an increase of 50.31%, 69.09%, 86.53%, 573.79%; MDA content increased 1.66,2.35,2.85,5.03 times; chlorophyll content decreased by 22.39%, 20.87%, 9.22%, 30.43%; soluble sugar, soluble protein and SOD, POD activity of drought stress 6d peak, peak drought stress first 3d CAT activity continues to the drought stress CAT activity decreased. 4 farming under drought stress the ornamental bamboo physiological and biochemical indicators of variance analysis showed that different bamboo species, the impact of the different stress time on the physiological and biochemical indicators were highly significant. (3) 4 bamboo species of the physiological and biochemical indices of principal component analysis farming physiological and biochemical indices of 10 ornamental bamboo correlation analysis, correlation between soluble sugar and chlorophyll, malondialdehyde content was not significantly soluble sugar and water content in leaves and between the soluble protein and chlorophyll content showed a significant positive correlation (P lt; 0.05), among other indicators were tested highly significant correlation (P lt; 0.01). Leaf water content and chlorophyll, soluble sugar, soluble protein, CAT, POD, SOD and other indicators were positively correlated with the cell membrane permeability, MDA, proline was negatively correlated. The physiological indicators reflect to some extent will have overlapping effects, the use of principal component analysis to better evaluate their drought resistance. The principal component analysis showed that: reflect 4 farming ornamental bamboo Drought sexual performance indicators descending order as CAT, SOD and proline, POD, soluble protein, leaf water content, membrane permeability, soluble sugar, MDA chlorophyll content. (4) farming comprehensive evaluation of drought resistance of ornamental bamboo plant drought resistance are complex traits of many factors, the direct evaluation criteria Drought indicators as a single indicator is difficult to fully reflect the real plant drought resistance. Therefore, the membership function of the fuzzy mathematics comprehensive evaluation of Four Ornamental Bamboo drought. Farming ornamental bamboo drought resistance from high to low Sort order: yellow stripe Diamond Bamboo gt; Philippine white bamboo gt; Philippine Wong Chuk gt; flooring bamboo, which is 4 farming ornamental bamboo drought analyzed by the membership function Stress external morphology was consistent.
|