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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
The development of in vitro induced fiber of cotton ovule was not only significantly different between genotypes, but also the concentration of N H4 + significantly affected the induction rate of detached fiber. Under the condition of N 0 3 - 50 m mol / L as nitrogen source , Adding N H4 + in low concentration (5.0 m mol / L) can increase the fiber’s induction rate and promote the fiber growth. Under the condition of constant total nitrogen, N H4 + / N O3 - the proportion of fiber induction rate will be reduced, the fiber growth and development are correspondingly inhibited ⒚