Abstract
The greater susceptibility to difenzoquat of Sicco compared with Butler spring wheat could not be attributed to differences in retention of spray solution, development of chlorosis, foliar penetration, and movement of [ 14C]difenzoquat or cell elongation in the coleoptile straight growth test or excised developing leaf segments. However, following difenzoquat treatment, susceptible Sicco compared with tolerant Butler tillered prolifically and sustained a greater reduction in main shoot length, lamina length, and foliage dry matter. While accumulation of [ 14C]difenzoquat in the region of the apical meristem was similar in both cultivars, DNA synthesis monitored by [ 14C]thymidine incorporation in sections containing the apical meristem was inhibited substantially more in Sicco than in Butler. It is proposed that a major contribution to the difference in response between the two cultivars is a differential inhibition of DNA synthesis in the apical meristem.
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