Study On The Source-sink Relationship Of Amorphophallus

Currently, Konjac can provide a lot of glucomannan,which owns high economic value, but low yield is the bottleneck of the konjac plant industry. From the theory on source-sink, crop yield depends both on the production capacity of photosynthetic substancesource, but also depends on the size and capacity of the library, and larger storage capacity was able to promote production and operation of photosynthetic substance sources, the formation of crop yield and quality was the process of sourcelibrary interactionessentially. Therefore, the study of coordinating relations with konjac source library has important theoretical and practical significance to improve the yield of konjac. In this paper, based on the high yield cultivation technology, Amorphophallus konjac and Amorphophallus albus for material, through artificial changd the library source ratio, Measured the changes of source library indicators in different growth stages of two kinds konjac.To analysis of the formation of konjac population source, distribution of photosynthetic products,and the formation characteristic of groups library To investigate the source library feature of konjac high-yielding and physiological basis of source library formation, To provide theoretical basis for the realization of high-yielding and scientific regulation about konjac. Test results were as follows:1. The correlation coefficients between dry matter accumulation and LAI of A. albus and A. konjac are 0.889 and 0.840, showed a significant positive correlation. The correlation coefficients between dry matter accumulation and LAD of A. albus and A. konjac are 0.909 and 0.929, showed a respective significant positive correlation. So, LAI and LAD are two important indicators to measure the size of the source of konjac. Increasing the leaf area and photosynthetic time can improve the dry matter production of konjac source. Over time, the leaf photosynthetic products distribution rate declined, while the bulb distribution rate rise. Transfer time of konjac growth centers appear consistent with the LAI peak time. And then concludes:the size and duration of allocation about photosynthetic products direct influence the built and enrichment of konjac soure-sink shape.2. The volume and dry matter accumulation of konjac corm is upward trend, over time. Besides, September 7 to September 27, is the Conn volume growth and dry matter accumulation rates up period. So the stage is Critical period of konjac. After September 7, the corm dry matter accumulation rate and volume growth ratio of A. albus is 0.20, and the corm dry matter accumulation rate and volume growth ratio of A konjac is 0.16. Compared to A. albus, A. konjac dry matter accumulation rate can not keep up with the growth rate of the volume of corm, is not conducive to the full capacity.3. Stepwise regression analysis was used to screen konjac production and key indicators, the regression equation is Y=-0.871+5.135 Xj+0.370 X2+0.142 X3(Where Y is corm yield, X1 for corm dry matter content, X2 corm dry matter accumulation rate, X3 for LAD). So corm dry matter accumulation and rate are the main factors affecting production, with higher photosynthetic capacity is the basis of the source of konjac yield formation. The key indicators affecting production is konjac corm dry matter accumulation, corms volume and photosynthetic potential.4. The different cultivation Measures to deal with konjac will have some impact with its source and sink. With the increase of the density, The economic total production of konjac groups under different densities appear unimodal curve trends. Namely in a certain planting density range, with the increase of the density of (9<6<3 = 8<5), konjac yield also increases (9<6<3<8<5). After more than a certain planting density (5), with the increase of planting density (5<2<7<4<1), konjac yield decreases with increasing density (5> 2> 7> 4> 1). That is planting density by influencing the LAI, LAD’s size and reach peak time, thereby affecting the built shape of konjac source. At the same time on different planting densities konjac corm and rhizomes weight ratio of impact, within a certain range the greater the Ratio, the lower the density, which is the production adjustment konjac target library morphogenesis important.5. Different fertilization treatments primarily affect the size of LAI and LAD, while impact the konjac plant dry matter accumulation. Specific performance:nitrogen fertilizer can promote the production capacity of the plant photosynthetic source. Konjac leaf morphogenesis less demand for phosphorus, too much phosphorus fertilizer for leaf formation would be a disincentive konjac, konjac blades make for reduced energy utilization. Early in the growing season different potassium groups LAD change is insignificant. High potassium in the late growing population has a higher photosynthetic potential. Adequate potassium nutrition can maintain strong synthesis of proteins and carbohydrates, thus promoting the process of plant metabolism and photosynthetic intensity, and delayed leaf senescence, the population will maintain a high photosynthetic potential.