为什么玉米粒的行数是双数?为什么会出现乱行?

普田农科院品种管理部

<h3>一、为什么玉米粒的行数是双数? 玉米的果穗在最早发育的时候,会在每个穗轴节(组成果穗的结构,排列很紧密的)上着生两个无柄的小穗,每个小穗里面又有两个小花。一般的是上位花结实,下位花退化。 关键在于,这两个无柄小穗都是成对排列成行,所以玉米地行数一般就是双数。 有时候小穗的发育受到影响,可能会出现这一对小穗里的一个没有授粉或者没有结成种子,但是总体上不影响玉米地行数。<br></h3> <h3><strong style="max-width: 100%; color: rgb(51, 51, 51); font-family: 微软雅黑; font-size: 16px; font-variant-ligatures: normal; letter-spacing: 0.544px; orphans: 2; text-align: justify; white-space: normal; widows: 2; word-wrap: break-word !important;"><span style="max-width: 100%; color: rgb(255, 41, 65); word-wrap: break-word !important; background-color: rgb(255, 251, 0);">二、为什么会出现乱行?</span></strong></h3><h3><br></h3><p style="margin-top: 10px; margin-bottom: 10px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-variant-ligatures: normal; letter-spacing: 0.544px; orphans: 2; text-align: justify; text-indent: 0em; white-space: normal; font-family: -apple-system-font, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; line-height: 1.75em; word-wrap: break-word !important;"><span style="max-width: 100%; font-family: 宋体; word-wrap: break-word !important;">主要是因为水分、营养不均衡,导致上段不能吸收,下部疯长。</span></h3><p style="margin-top: 10px; margin-bottom: 10px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-variant-ligatures: normal; letter-spacing: 0.544px; orphans: 2; text-align: justify; text-indent: 0em; white-space: normal; font-family: -apple-system-font, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; line-height: 1.75em; word-wrap: break-word !important;"><span style="max-width: 100%; font-family: 宋体; word-wrap: break-word !important;">排列不齐是因为相应的位置授粉不均匀,导致部分受孕,部分没受孕,然后怀孕涨大的颗粒挤占没怀孕的家庭空间。</span></h3><p style="margin-top: 10px; margin-bottom: 10px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-variant-ligatures: normal; letter-spacing: 0.544px; orphans: 2; text-align: justify; text-indent: 0em; white-space: normal; font-family: -apple-system-font, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; line-height: 1.75em; word-wrap: break-word !important;"><span style="max-width: 100%; font-family: 宋体; word-wrap: break-word !important;">其实都有顺序的,只是受粉不好的籽会长不全,不信你可以拿排列不齐的来看,会发现有很多没长起来的小籽。</span></h3><p style="margin-top: 10px; margin-bottom: 10px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-variant-ligatures: normal; letter-spacing: 0.544px; orphans: 2; text-align: justify; text-indent: 0em; white-space: normal; font-family: -apple-system-font, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; line-height: 1.75em; word-wrap: break-word !important;"><span style="max-width: 100%; font-family: 宋体; word-wrap: break-word !important;">乱应该就是因为发育的时候有些小花没有结实,旁边的花结实挤过来就这样了。</span></h3><p style="margin-top: 10px; margin-bottom: 10px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-variant-ligatures: normal; letter-spacing: 0.544px; orphans: 2; text-align: justify; text-indent: 0em; white-space: normal; font-family: -apple-system-font, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; line-height: 1.75em; word-wrap: break-word !important;"><span style="max-width: 100%; font-family: 宋体; word-wrap: break-word !important;">这个就是和小花在发育过程中因为营养或者环境问题出现了缺失有关系。</span></h3>