Effects of Plant Growth Regulators on the Growth and Resistance Physiology of Banana Planting Big Seedlings

摘要

Take the ordinary banana transplanting seedlings as material, use potting experiment; take the seedlings that haven't been sprayed by plant growth regulator as the control group. In this paper, we study the effects of plant growth regulators on the growth, nutritional absorption and resistance physiology of banana planting big seedlings. The results show that compared with the control group, spraying gibberellin on the leaf can significantly increase the seedling height by27.75%, and increase chlorophyll content of 19.11%; effectively reduce MDA content of the leaf, increase proline content, increase SOD content of the leaf by21.94%, and increase POD content of 82.13% ; compared with the control group, Spraying α-sodium naphthalene acetate can significantly increase the seedling diameter by 17.67%, increase the seedling dry matter cumulant of 16.11%, and increase the strong-seedling index by 21.49%; Improve nitrogen and phosphorus nutrient uptake, increased by 9.95% and 9.95% respectively. So in breeding process of banana planting seedlings, in order to get robust provisonal planting seedlings, we should consider to spray the intermixtures of gibberellin and α-sodium naphthalene acetate, or spray these two regulators at specific intervals. Fostering healthy and strong banana planting seedling that have strong adverse resistance is the foundation of stable and high banana yield. These days, the banana seedling transplanting, mostly happens in the summer and fall, and is accompanied by problems that the recuperating period is long, the seedlings grow weakly, the survival rate is low, which lead to irregularity of bananas plants growth in later stage. [1-2]. Every year, the cold in winter and spring would damage banana production to the banana production areas in China, resulting in reduction of output, or even no harvest, which has become the factors restricting the development of the banana industry [3-4]. In addition, banana harvest time is too concentrated in China, which results in low banana prices, and discourage the enthusiasm of farmers [5-8]. So how to realize the seedling efficient transplanting, avoid the cold damage and adjust the harvest period is the key to high quality production of bananas. The current research has shown that on the basis of cultivating strong banana secondary planting seedlings, cultivate older planting seedlings, then transplant the seedlings to fields, which can effectively shorten seedling stage in the field, and avoid the harm from cold in the winter and spring, so as to realize the banana high quality production [6-8]. Therefore, the research on technology to foster robust older planting seedlings of banana is of great significance for the banana production. Studies have shown that gibberellin, multi-effect azole, α-sodium naphthalene acetate, Compound sodium nitrophenolate and diethyl aminoethyl hexanoate etc., are widely involved in the regulation of plant growth and development[8-13]. Gibberellin can promote plant growth, destroy the apical dominance, promote the growth of lateral branches, and break the dormancy, and regulate the flowering. Morphologically praying gibberellin on the crops would significantly promote the stem elongation, and within a certain range of concentration, as concentration is increased, the enhancement is increased [14]. Dipping the seedling root in Multi-effect azole can increase the survival rate. During seedling stage, spraying it on the stems can control the growth of the top, promote the growth of the lower part of the seedling, control the height of the seedling, promote root growth, improve the quality of the seedlings [15]. High purity of α-sodium naphthalene acetate can reduce the premature flower and fruit abscission rate, promote flowering and fruit setting, effective improve resilience of crops (16-17). Zi-long zhang, et al., [18] found diethyl aminoethyl hexanoate can significantly promote the soluble protein content of rice seedling under low tempe