NH_4~ 浓度对棉花未受精胚珠纤维离体发育的影响

棉花胚珠离体诱导纤维的发育 不但在基因型之间存在着很大的差异，而且 Ｎ Ｈ４ ＋ 浓度明显影响离体纤 维的诱导率⒚在以 Ｎ Ｏ３ － ５０ ｍ ｍ ｏｌ／ Ｌ 为氮源的基础上，添加低 浓度（５．０ ｍ ｍ ｏｌ／ Ｌ）的 Ｎ Ｈ４ ＋ ，能提高纤维的诱导率，促进纤维的生长⒚在总氮量不变的条件下，提高 Ｎ Ｈ４ ＋ ／ Ｎ Ｏ３ － 的比例，纤维的诱导率随之降低，纤维的生长发育也相应受到抑制⒚

Effects of NH_4~ concentration on fiber development from unfertilized cotton ovules in vitro .

The fiber inducing and development in vitro was affected not only by the genotypes of the explant used, but aslo by the NH 4 concentration . There were obvious effects of the NH 4 concentration on the fiber inducing percentage,which was increased dramatically when a lower concentration of NH 4 ( 5.0 mmol/L) was added in the media with 50 mmol/L of NO 3 -, The fiber inducing percentage was decreased and the fiber development was inhibited as the ratio of NH 4 /NO 3 - in the media was increased when the total nitrogen contents were constant.