The application of phosphorus(P)and a waterretaining polymer to the soil can increase the availability of P for Cordia trichotoma,having a positive effect on the plants.The objective of this study was to evaluate the ...The application of phosphorus(P)and a waterretaining polymer to the soil can increase the availability of P for Cordia trichotoma,having a positive effect on the plants.The objective of this study was to evaluate the morphological,physiological and biochemical characteristics of C.trichotoma plants were cultivated in a red argisol and treated with 120,240 and 360 kg P2O5 ha^(−1)and no phosphorous addition as a control,in the presence(5 g L^(−1)per seedling)and absence of a water-retaining polymer.Twentyfour months after planting,survival,height,stem diameter,shoot and root dry matter,leaf area,photosynthetic pigment concentration,chlorophyll a fluorescence,acid phosphatase enzyme activity(APase)and P in tissues and soil were determined.The polymer had no effect on survival and the other parameters.The addition of P increased growth,dry matter production,photosynthetic pigment concentrations,the use of light energy and maximum quantum yield of photosystem II.Plants cultivated in soil with 240 kg P2O5 ha^(−1)application had 4.7 and 5.4 times more shoot and root dry matter,respectively,than control plants.This dosage also showed 52.1%greater photochemical energy use than the control plants.Plants cultivated without the addition of P showed higher activity of the APase enzyme.展开更多
This study represents a geographical approach to morphological variation of cones, needles and seeds in natural dragon spruce （Picea asperata Mast.） populations across western China and the relationship between morp...This study represents a geographical approach to morphological variation of cones, needles and seeds in natural dragon spruce （Picea asperata Mast.） populations across western China and the relationship between morphological traits and weather variation for the origins of populations. Significant differences were found for all cone, needle and seed traits among populations and trees within populations. The coefficients of variation in 2 higher latitude populations were higher than those in other populations in all traits except for needle width and seed width. Fairly high within-population variability was also detected for cone dry weight, seed dry weight and needle traits in this study. Cone length, cone width, cone dry weight, seed scale length, seed scale width and seed wing length were strongly positively intercorrelated. Seed length and seed dry weight showed a significantly positive correlation with seed wing length. And needle width showed a significant negative correlation with cone traits, seed scale length, seed wing length and seed length. The higher the annual mean temperature, the higher the average cone length. This study also revealed a negative linear dependence on latitude： the higher the latitude, the lower the population average seed length. Seed dry weight was positively and linearly related with altitude.展开更多
We investigated phenotypic variation ofPopulus simonii from five provenances in northern China. Our results show that significant differences exist between plants of different provenances in morphological and physiolo...We investigated phenotypic variation ofPopulus simonii from five provenances in northern China. Our results show that significant differences exist between plants of different provenances in morphological and physiological traits, except for leaf-stalk length and the number of leaf margins. The coefficient of variation for all traits ranges from 14.77% to 81.49%. The mean phenotypic coefficient of differentiation （VST） is 47.1%, which means that the variation within provenances is the major source for phenotypic variation in P. simonii. Given our cluster analysis of provenances based on an average linkage computing method, the five provenances ofP. simonii investigated could be divided into three groups. Our results provide a theoretical basis for genetic resource conservation and provenance selection of natural P. simonii in northern China.展开更多
基金supported by the Council for Scientific and Technological Development(CNPq)and the Coordination for the Improvement of Education Personnel(CAPES).
文摘The application of phosphorus(P)and a waterretaining polymer to the soil can increase the availability of P for Cordia trichotoma,having a positive effect on the plants.The objective of this study was to evaluate the morphological,physiological and biochemical characteristics of C.trichotoma plants were cultivated in a red argisol and treated with 120,240 and 360 kg P2O5 ha^(−1)and no phosphorous addition as a control,in the presence(5 g L^(−1)per seedling)and absence of a water-retaining polymer.Twentyfour months after planting,survival,height,stem diameter,shoot and root dry matter,leaf area,photosynthetic pigment concentration,chlorophyll a fluorescence,acid phosphatase enzyme activity(APase)and P in tissues and soil were determined.The polymer had no effect on survival and the other parameters.The addition of P increased growth,dry matter production,photosynthetic pigment concentrations,the use of light energy and maximum quantum yield of photosystem II.Plants cultivated in soil with 240 kg P2O5 ha^(−1)application had 4.7 and 5.4 times more shoot and root dry matter,respectively,than control plants.This dosage also showed 52.1%greater photochemical energy use than the control plants.Plants cultivated without the addition of P showed higher activity of the APase enzyme.
文摘This study represents a geographical approach to morphological variation of cones, needles and seeds in natural dragon spruce （Picea asperata Mast.） populations across western China and the relationship between morphological traits and weather variation for the origins of populations. Significant differences were found for all cone, needle and seed traits among populations and trees within populations. The coefficients of variation in 2 higher latitude populations were higher than those in other populations in all traits except for needle width and seed width. Fairly high within-population variability was also detected for cone dry weight, seed dry weight and needle traits in this study. Cone length, cone width, cone dry weight, seed scale length, seed scale width and seed wing length were strongly positively intercorrelated. Seed length and seed dry weight showed a significantly positive correlation with seed wing length. And needle width showed a significant negative correlation with cone traits, seed scale length, seed wing length and seed length. The higher the annual mean temperature, the higher the average cone length. This study also revealed a negative linear dependence on latitude： the higher the latitude, the lower the population average seed length. Seed dry weight was positively and linearly related with altitude.
基金supported by grants from the Changjiang Scholars Program of the Ministry of Education of China (Prof. Bailian Li)the National Natural Science Foundation of China (Grant Nos. 30600479,30872042)+3 种基金the Major Science Foundation of the Ministry of Education of China (Grant No. 307006)the Foundation for the Author of National Excellent Doctoral Dissertation of the China (Grant No. 200770)the Program for New Century Excellent Talents in University (Grant No. NCET-07-0084)the Introduction of Foreign Advanced Agricultural Science and Technology into China (Grant No. 2009-4-22)
文摘We investigated phenotypic variation ofPopulus simonii from five provenances in northern China. Our results show that significant differences exist between plants of different provenances in morphological and physiological traits, except for leaf-stalk length and the number of leaf margins. The coefficient of variation for all traits ranges from 14.77% to 81.49%. The mean phenotypic coefficient of differentiation （VST） is 47.1%, which means that the variation within provenances is the major source for phenotypic variation in P. simonii. Given our cluster analysis of provenances based on an average linkage computing method, the five provenances ofP. simonii investigated could be divided into three groups. Our results provide a theoretical basis for genetic resource conservation and provenance selection of natural P. simonii in northern China.
