拔节期阶段性干旱对小麦茎蘖成穗与结实的影响

李萍,尚云秋,林祥,刘帅康,王森,胡鑫慧,王东

Effects of Drought Stress During Jointing Stage on Spike Formation and Seed Setting of Main Stem and Tillers of Winter Wheat

LI Ping,SHANG YunQiu,LIN Xiang,LIU ShuaiKang,WANG Sen,HU XinHui,WANG Dong

表1 小麦幼穗发育时期

Table 1 Spike developmental score of wheat

幼穗发育时期及特征 Spike developmental stage and its characteristic 发育阶段 Developmental score 生长锥伸长期 Transition apex 1.5 单棱期 Early double ridge stage 2 二棱期 Double ridge stage 2.5 颖片原基分化期 Glume primordium present 3 外稃原基分化期 Lemma primordium present 3.25 小花原基分化期 Floret primordium present 3.5 雄蕊原基分化期 Stamen primordium present 4 雌蕊原基分化期 Pistii primordium present 4.25 心皮原基分化期 Carpel primordium present 4.5 三心皮包围胚珠期 Carpel extending round three sides of ovule 5 花柱管闭合,子房仅顶部保持开放状态 Stylar canal closing; ovarian cavity enclosed on all sides but still open above 5.5 花柱管开口,柱头突起形成 Stylar canal remaining as a narrow opening; two short round style primordia present 6 花柱开始伸长 Style begin elongation 6.5 柱头上分化出柱头分枝 Stigmatic branches just differentiating as swollen cell on styles 7 柱头分枝和子房壁上羽毛伸长 Stigmatic branches and hairs on ovary wall elongation 8 柱头分枝和子房壁上羽毛继续伸长,柱头分枝缠绕无絮 Stigmatic branches and hairs on ovary wall continue to elongate; stigmatic branches from a tangled mass 8.5 花柱和柱头分枝直立,羽状柱头分化 Styles and stigmatic branches erect; stigmatic hairs differentiating 9 花柱和柱头分枝向外展开,羽状柱头发育完全 Styles and stigmatic branches spreading outwards. Stigmatic hairs well developed 9.5 花柱向外弯曲,柱头分枝伸展,花粉落在羽状柱头上 Styles curved outwards and stigmatic branches spread wide; pollen grains an well-developed stigmatic hairs 10