EFFECT OF GIBBERELLIN ON GROWTH AND DEVELOPMENT OF Spondias tuberosa SEEDLINGS

ABSTRACT The development of technologies will certainly contribute to boost the commercial exploitation and domestication of Spondias tuberosa. The objective of the present study was to identify morphophysiological effects of gibberellin on the growth of S. tuberosa seedlings. The experiment was conducted in a greenhouse at the Goiás State University, Brazil, using 300-day-old S. tuberosa seedlings planted in 12-liter pots containing soil (Typic Hapludox), sand, and manure (3:1:0.5). The experiment was conducted in a completely randomized design, with five replications and six treatments consisting of single foliar applications of 30 mL plant-1 of solutions with different gibberellin (GA3) concentrations (0, 150, 300, 450, 600, and 750 mg L-1), using a manual sprayer. The plants were evaluated at 60 days after the applications. The maximum biomass accumulation in S. tuberosa seedlings was found with the use of 415 mg L-1 of GA3. The use of gibberellin accelerated the vegetative growth of S. tuberosa plants and enabled the formation of seedlings with better root system and xylopodium, and aerial parts with greater number of leaves, leaf area, and stem weight.

摘要
技术的进步无疑将推动块茎状槟榔青（Spondias tuberosa）的商业化开发与人工驯化。本研究旨在明确赤霉素（gibberellin）对该物种幼苗生长的形态生理效应。
本试验于巴西戈亚斯州立大学的温室设施内开展，供试材料为300日龄的块茎状槟榔青幼苗，种植于容积12升的花盆中，盆内基质按3:1:0.5的体积比混合了土壤（典型强发育湿润老成土，Typic Hapludox）、沙子与有机肥。试验采用完全随机设计，设置5次重复，共6个处理组：以手动喷雾器对幼苗单次叶面喷施30 mL·株⁻¹的不同浓度赤霉素（GA3）溶液，浓度梯度为0、150、300、450、600、750 mg·L⁻¹。于喷施后60天对植株进行指标测定。结果显示，当赤霉素浓度为415 mg·L⁻¹时，块茎状槟榔青幼苗的生物量积累达到最大值。赤霉素的施用可加快块茎状槟榔青植株的营养生长，培育出根系与木质块茎（xylopodium）发育更佳的幼苗，同时使地上部分拥有更多的叶片、更大的叶面积以及更高的茎干生物量。