Gibberellin Biosynthesis Inhibitors Help Control Plant Height for Improving Lodging Resistance in E. Tef (Eragrostis tef)
Gibberellin Biosynthesis Inhibitors Help Control Plant Height for Improving Lodging Resistance in E. Tef (Eragrostis tef)
复制标题
DOI：
10.1080/15427528.2011.646056
复制
发表时间：
2012-01-01
影响因子：
1.3
通讯作者：
Kunert, Karl
中科院分区：
文献类型：
--
作者：
Gebre, Endale;Schluter, Urte;Kunert, Karl
画眉草（Eragrostis tef）是一种生长在东非的高大、高营养的谷物，它存在严重的倒伏问题，大大降低了其生产力。已知某些植物生长调节剂会限制生长，从而通过影响赤霉素生物合成来提高谷物的抗倒伏性。针对具有矮表型的 Gea Lammie 品种和具有高表型的 DZ-01-196 品种，测定了生长调节剂矮壮素 (CCC) 对身高的影响。矮壮素使 Gea Lammie 的株高降低了 27%，使 DZ-01-196 的株高降低了 46%。通过在高特夫品种 DZ-01-196 上添加多效唑 (PBZ) 进行的生长调节剂应用的更详细分析表明，CCC 和 PBZ 均减少了秆长度，但对节间直径没有影响。 100 mM 矮壮素特别缩短了最下部节间的长度。另一方面，用 CCC 处理并没有增加圆锥花序分蘖，但 CCC 处理植物的籽粒产量与未处理对照相当。因此，赤霉素生物合成的调控可能是提高画眉草抗倒伏性的关键目标。
Eragrostis tef, a tall stature and highly nutritious cereal grown in East Africa, has a serious lodging problem that reduces its productivity considerably. Certain plant-growth regulators are known to restrict growth and consequently improve lodging resistance in cereals by affecting gibberellin biosynthesis. The effect on height of growth regulator chlormequat chloride (CCC) was determined for varieties Gea Lammie with a short phenotype and DZ-01-196 with a tall phenotype. Chlormequat chloride decreased plant height by 27% in Gea Lammie and by 46% in DZ-01-196. More detailed analysis of growth regulator application by including Paclobutrazol (PBZ) on the tall tef variety DZ-01-196 revealed that both CCC and PBZ reduced culm length, but had no effect on internode diameter. Chlormequat chloride at 100 mM especially reduced the length of the lowermost internodes. Treatment with CCC on the other hand did not increase panicle-bearing tillers, but grain yield in CCC-treated plants was comparable to non-treated control. The regulation of gibberellin biosynthesis could therefore be a key target for improving lodging resistance in Eragrostis tef.