Apical dominance is inhibition of growth of lateral buds under the influence of growing terminal buds. Number of buds sprouted on a cane after pruning, the ratio of length of terminal shoots to that of sub terminal shoots and total shoot length per cane at a constant bud load are the measures of apical dominance. Location of subsequent bud on a cane is on opposite side of a cane. Therefore, the effect of apical dominance of a terminal bud is not on the second bud from the tip, but is on the third bud(Chadha and Shikhamany, 2). The degree of the apical dominance varies with the climate with in a variety. Olmo (4) reported higer degree of apical dominance in tropics than in the temperate conditions. The variation in the genotype and rootstocks influence on the degree of apical dominance is attributed to the endogenous levels of auxins synthesized in the growing tips and the cytokinins in the roots. Auxin promotes apical dominance while, the cytokinin suppresses it. This investigation was undertakento know the influence of rootstocks on apical dominance in Thompson Seedless.
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机译：顶端优势是在生长的顶芽的影响下抑制侧芽的生长。修剪后在甘蔗上发芽的芽数，末端芽的长度与亚末端芽的长度之比以及在恒定芽负荷下每根茎的总芽长是根尖优势的量度。后续芽在甘蔗上的位置在甘蔗的相反侧。因此，顶芽的顶端优势不是从尖端到第二芽，而是在第三芽上（Chadha and Shikhamany，2）。顶端优势程度随气候而变化。 Olmo（4）报告说，热带地区的顶端优势程度高于温带条件。基因型和砧木的变化对根部优势程度的影响归因于生长尖端合成的生长素和根中的细胞分裂素的内源水平。生长素促进根尖的统治，而细胞分裂素抑制它。进行这项调查是为了了解汤普森无核砧木砧木对根尖优势的影响。
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