Bioassay of Winter Wheat for Gibberellic Acid Sensitivity
Bioassay of Winter Wheat for Gibberellic Acid Sensitivity作者机构：Department of Agronomy and Horticulture University of Nebraska Panhandle Research & Extension Center Scottsbluff USA Department of Soil and Crop Sciences Texas A&M University College Station USA.
出 版 物：《American Journal of Plant Sciences》 (美国植物学期刊（英文）)
年 卷 期：2013年第4卷第10期
页 面：2015-2022页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Plant Growth Regulator Gibberellin Planting Aid Cover Crop
摘 要：Increasing winter wheat seedling growth would make it a better winter cover crop. Gibberellic acid (GA3) seed treatment may accomplish this by stimulating stem growth. A bioassay, mimicking field conditions, could determine the relative sensitivity of conventional and semi-dwarf cultivars. In growth chambers set for cool (10℃/4℃) and warm (21℃/4℃) conditions, wheat seeds were treated with 0 and 125 to 16,000 ppm GA3. The cultivars Goodstreak (tall or conventional) and Wesley (semi-dwarf) were compared as standards. Emergence and plant height were measured. “Goodstreak showed a significant growth promotion at 500 ppm GA3 when seeds were dipped and 2000 ppm when GA3 was applied in-furrow under both temperature regimes. “Wesley in general required the same or a higher dose of GA3. Separately, the seeds of nine other cultivars were treated with GA3 as the standards. Based on maximum height promotion, the most sensitive cultivars under cool conditions were Goodstreak, Harry, Millenium, and Wahoo;under warm conditions, the most sensitive cultivars were Alliance, Goodstreak, Jagalene, and Millenium. In general, the least GA3 sensitive cultivars were Arrowsmith, Scout66, and Wesley. “Buckskin and “InfinityCL were intermediate. The rye cultivar Rymin also was tested and showed less sensitivity to GA3 than “Goodstreak. When 6 benzyladenine (6BA) with GA3 was applied to “Goodstreak and “Wesley seed, emergence, plant height and weight, and tiller formation were reduced. Wheat cultivars will respond to GA3 and differ in the amount of GA3 needed. The results of this growth chamber study will guide subsequent field trials.
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