Structural Characteristic and Genetic Expression of nodulin-like Gene and Its Promoter in Cotton Review of research advancements on the molecular basis and regulation of symbiotic nodulation of legumes Functional Analysis of Nodulin-like Promoter in Transgenic Cotton Plants Effect of Intermittent Drought on Nodule Formation of Alfalfa Primary Analysis of the Function of Nodulin MtN21 Gene At1 g09380 in Arabidopsis thaliana Effectiveness Investigation and Influencing Factors Analysis of Alfalfa Rhizobia Progress in the study of leghemoglobin