Dissertation > Excellent graduate degree dissertation topics show

Organic Acids on Soil Potassium Release Kinetics Analysis and Genetic Studies of Tobacco Roots Secrete Citrate

Author: LiHongChen
Tutor: YangTieZuo
School: Henan Agricultural University
Course: Tobacco science
Keywords: tobacco genotype citric acid secretion Inheritance
CLC: S572
Type: Master's thesis
Year: 2013
Downloads: 41
Quote: 0
Read: Download Dissertation

Abstract

Potassium is an element of the quality of the tobacco, low potassium content of tobacco hasbeen a limiting factor for yield and quality. In order to improve the absorption of tobacco on soilpotassium use efficiency, thereby increasing the potassium content of the experimental analysis ofdifferent low molecular weight organic acids on soil potassium activation ability of the20normaltobacco genotypes for potassium and potassium roots under stress conditions sensitive potassiumcitrate secretion capability and were analyzed and studied the ability of tobacco root citratesecretion genetic law, the main findings are as follows:Low molecular weight organic acids are significantly promote the release of soil potassium,the main means of acid hydrolysis and complexation dissolved. Ionized organic acid in solutionand the organic acid ion is a proton, proton aluminosilicate effect on the soil, to bring about acidhydrolysis reaction releases potassium, A plurality of ions in the organic ligand, the surface of thesoil minerals with aluminum, silicon and other metal atoms to form soluble complexes, therebyundermining the lattice structure, promote the release of potassium. Capacity of soil potassiumacid activation: oxalic acid> citric acid> malic acid> acetic acid> lactic acid. Aluminum complexstability constant activation of soil potassium citrate larger capacity than the smaller complexstability constants of oxalic acid, oxalic acid ionization due to a higher degree of acidity strongerthan citric acid. Acetic acid and lactic acid monobasic acid hydrolysis and complexation capacityis weak, activate soil potassium low capacity.1Soil potassium release into quick release and the release of two stable phases.0-100h forfast release phase, potassium release speed, release large units, short duration.100h after therelease phase stable, slow release potassium, potassium emission per unit time is small, longduration. Dynamic curve of soil potassium release in nearly logarithmic equations and exponentialequations fit better with the parabolic equation was poor.2Potassium Deficiency effects of tobacco root growth, resulting in smaller root volume, Tobacco root volume of different genotypes affected differently by potassium deficiency stress,root volume reduction genotypes with low levels of high ability to resist stress. Root volume androot citrate secretion correlation is not significant. Soil potassium deficiency leads to tobaccoexudate potassium decreased, different genotypes decreased to varying degrees. According to theamount of root exudates and exudate citrate potassium content was significantly related todifferent genotypes can be inferred exudates and root secretion of potassium citrate capacity.Normal potassium and potassium for different genotypes under stress conditions citratetobacco root secretion ability differences, According to cluster analysis can be divided into threetypes genotype, high secretion genotypes, genotype secretion speed stage, the low secretiongenotypes. Potassium sensitivity among different genotypes are different, can be divided into threetypes, high potassium sensitive genotypes, genotype sensitivity in potassium, low potassiumsensitive genotypes. With citric acid and potassium secretion average of sensitivity limits genotypecan be divided into four types: Ⅰ class is a high volume and high potassium citrate secretionsensitive genotype; Ⅱ class is a high secretion of lemon the amount of acid and potassiumsensitive genotype; Ⅲ class is having a low total potassium secretion and high sensitivitygenotype; Ⅳ class is low weight and low potassium secretion susceptibility genotypes.3Tobacco roots secrete citrate ability to meet "additive-dominant" genetic model, geneticdominant effects, genetic additive effect is small. Potassium sensitivity does not meet the "additive-dominant" genetic model. Therefore, you can filter through heterosis strong roots secrete citricacid genotypes. GCA values greater capacity in citric acid secretion is an excellent parent.Nongda202citric acid secretion capacity GCA values are positive, potassium nutrition inimproving the efficiency of future generations; it has a higher value in use. Crosses the ability ofcitric acid root exudates positive effect SCA larger the value, excellent offspring screened byhybridization mix could draw the higher the value, Crosses CAU202×NC628specificcombining ability effect values are positive in improving the efficiency of the use of futuregenerations Potassium higher value.

Organic Acids on Soil Potassium Release Kinetics Analysis and Genetic Studies of Tobacco Roots Secrete Citrate

Abstract

Related Dissertations