Expression and Characterization of a Novel Vacuole Na+/H+ Antiporter Gene in Rice (Oryza sativa) Characterization and Expression of Nitrate Transporter Gene OsTNrt2.1 in Rice (Oryza sativa L.) THE KARYOTYPE ANALYSIS OF RICE(ORYZA SATIVA) Genetic Analysis and Gene Mapping of a degraded hull 2 (dh2) Mutant in Rice (Oryza sativa) Identification and Gene Fine Mapping of White Panicle Mutant wp4 in Oryza sativa Identification and Gene Mapping of Rice Early Senescent Leaf (esl3) Mutant Identification and Gene Fine Mapping of an Early Senescent Leaf Mutant esl5 in Oryza sativa