The vigorous growth phenotype of ‘Bondi’ is characteristic of high endogenous gibberellins, making it ideal for evaluating the efficacy of gibberellin biosynthesis inhibitors to improve allometric partitioning and production efficiency in potato. Foliar applications of prohexadione-calcium decreased foliar growth with no effects on tuber number, size, or yield. In contrast, when applied pre-tuberization, paclobutrazol decreased maximum foliar growth from 91 to 63 MT ha⁻¹, increased tubers plant⁻¹ from 6.4 to 8.9, and decreased average tuber fresh weight from 296 to 188 g tuber⁻¹ with no reduction in tuber yield, which effectively increased the harvest index. However, when applied post-tuberization, PBZ reduced maximum foliar growth from 91 to 72 MT ha⁻¹ with no effects on tuber number, size, or yield. Paclobutrazol can alter source/sink relationships in potato to increase production efficiency and this may translate to reduced agronomic inputs. Application timing and concentration are important for modulating tuber set and size.

中文翻译：

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用植物生长抑制剂提高马铃薯的生产效率

'Bondi'的强劲生长表型是高内源赤霉素的特征，使其非常适合评估赤霉素生物合成抑制剂改善马铃薯异向分配和生产效率的功效。叶面喷施己二酮钙可减少叶面生长，而对块茎数量，大小或产量无影响。相反，当进行预块茎施用时，多效唑可将最大叶面生长量从91 MT ha ^-1降低到63 MT ha ^-1，将块茎植物^-1从6.4增加到8.9，并且将平均块茎新鲜重量从296 g ^-1减少到188 g块茎^-1，而没有减少。块茎产量的增加，有效提高了收获指数。但是，在施肥后，PBZ可以将最大叶生长量从91 MT公顷减少到72 MT公顷^-1，对块茎数量，大小或产量没有影响。多效唑可以改变马铃薯中的源/库关系，从而提高生产效率，并且这可能导致农艺投入减少。施药时间和浓度对调节块茎的大小和大小很重要。