Dissertation
Dissertation > Agricultural Sciences > Crop > Cereal crops > Wheat > Wheat

Effects of Plant Growth Regulators on Logding Risistance of Stem and Yield,Quality in Wheat

Author ZhuZhanHua
Tutor JiangDong
School Nanjing Agricultural College
Course Crop Cultivation and Farming System
Keywords Wheat Plant growth regulator Yield Lodging Stalk Quality
CLC S512.1
Type Master's thesis
Year 2011
Downloads 38
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Crop lodging is a complicated phenomenon that is influenced by many factors from physiology and genetics, to husbandry and environment. Lodging is a major problem in crop production which causes poor grain filling and yield loss, reduces grain quality and mechanical harvesting efficiency. Lodging in crop is defined as permanent diaplacement of culms from their upright position. This study that two winter wheat cultivars Xumai856(XM856) and Yannong19(YN19) were subjected to sprayed with different plant growth regulators(PGRs) at wheat booting stage, In a field experiment, PGRs treatments were applied ethephon (ETH), gibberellic acid (GA3) and abscisic acid (ABA), control with sprayed water (CK). Analysis to effect of exogenous PGRs on inner structural matters of stem and outer morphological of stem, for example, internode length, thickness of internode, wall thickness of each internode. internode plumpness. The main results of the study are listed below1. Crop lodging is a chronic constraint. Cultivar selection and use of PGRs are the two factors that can alter lodging incidence to a significant extent. To choose four variety exogenous PGRs spray whole wheat stem at began of booting stage, The aim of this experiment is to measure effects of exogenous PGRs on Lodging resistance wheat stem. In this study, the correlation stem diameter, thickness of well internode, the length of internode, content of cellulose and lignin. Lodging resistance index and Lodging resistance of stem wheat. The result showed, the different treatments is different of lodging resistant abilities, ABA、ETH treatments beneficial to Lodging resistant of stem,hence, certain Lodging resistance ability was exist. But 6-BA、GA3 treatments slight decrease than control.2. This paper studied the effects of different plant growth regulators on carbon and nitrogen metabolism. dry matter transforming and grain yield in three winter wheat cultivars. XM856 and YN19, under field conditions, sprayed with ETH、6BA、ABA and GA3.and analyzed the effect of different plant growth regulators on redistribution amount of nitrogen accumulated pre-anthesis and redistribution efficiency of nitrogen accumulated pre-anthesis. The results showed that ETH treatment reduced the nitrogen amount accumulated pre-anthesis and contribution of redistribution efficiency of nitrogen accumulated pre-anthesis(RANP) to grain nitrogen, but 6-BA、ABA and GA3 treatments increased the amount of nitrogen accumulated pre-anthesis and redistribution efficiency of nitrogen accumulated pre-anthesis, Compared with CK. In this study, to studied the effect of PGRs on the amounts and remobilization rate of stored assimilate before anthesis in wheat vegetative organs with the grain yield, the results showed that ETH trentment decreased the redistribution of pre-anthesis stored assimilates in vegetative organs,resulting in the decrease of grain yield, but ABA,6-BA and GA3 treatments increased amounts and remobilization rate of pre-anthesis stored assimilates in leaves, hull and rachis,stem and sheathes.and ABA,6-BA and GA3 treatments promote grain filling rate, thus increased grain dry matter weight, but ETH treatment reduce to grain filling rate and accumulates grains dry matter weight. These results showed that 6-BA, ABA and GA3 treatments promoted to Carbon and Nitrogen assimilate translocation, increased to grain yield, the ETH treatment decreased to Carbon and Nitrogen assimilates transportation, due to decreased grain yield, these yield losses were related to the decreases in dry matter accumulation.3. The study the effect of endogenous PGRs on starch and its components contents, falling number, wet gluten content and SDS-sediment. and to analyze the changes of starch paste traits and farinograph parameters. The result indicated that ETH treatment to reduced starch content which resulted in the significant decrease in amylase content and amylopectin content,Compare with control.6-BA,ABA and GA3 treatment to increased amylase and amylopectin content, respectively. which resulted to increase starch contents. By 6-BA.ABA and GA3 treatments, to prolonger stability time and development time than CK differently extent. but existed difference among different wheat cultivar under ETH and GA3 treatments. Effect of PGRs on starch viscosity of wheat cultivar, starch Peak viscosity and Through viscosity were increased by 6-BA,ABA and GA3 treatments, but ETH treatment was existed different among different wheat cultivar. Compared with CK. were reduced in both cultivars XM856 and YN19. Finally, wet gluten content. SDS-sedimentation volume, development time and stability time increased, while the softening degree and gulten index decreased under each treatments in this study. In summary, Lodging resistance is particularly important in development of high-yielding cultivars, The application of chemical growth regulators to shorten crops and reduce lodging is widespread in many countries. since, in this study, we used fourth plant growth regulatows, When applied at the late booting stage, then the wheat spikelet begin to degrade on a large scale, the adverse effect of PGIs on kernels per spike will be the least, and the lodging resistance in wheat would be enhanced which are beneficial to yield improvement. In order to prove this hypothesis, the objective of this study was to determine the effect of PGR, applied on the late growth stage, on the morphological traits. Such as plant height, internodes length, cross-sectional area of stem and culm wall thickness ect in wheat. The influence of PGRs on the yield compositions was also studied.the resulted showed that ETH and ABA treatments were increased lodging resistance of stem, inversed resulted under 6-BA and GA3 treatments.the effect of PGRs on the grain yield, ABA,6-BA and GA3 were increased grained yield, under ETH treatment, to decreased yield.

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