Defective cell proliferation in the floral meristem of alloplasmic plants of Nicotiana tabacum leads to abnormal floral organ development and male sterility

摘要: Flowers of an alloplasmic male-sterile tobacco line, comprised the nuclear genome Nicotiana tabacum and cytoplasm repanda, develop short, poorly-pigmented petals abnormal sterile stamens that often are fused with carpel wall. The development flower organ primordia establishment boundaries between different zones in floral meristem were investigated by performing expression analysis orthologs identity genes GLO, AG DEF. These studies support conclusion boundary formation was impaired organs produced whorls 3 4 resulting partial fusions anthers carpels. According to investigations cell divisions size line drastically reduced comparison male-fertile line. reduction leads a discrepancy number determination at stage when petal stamen should be initiated. At same homeotic delayed However, not due failure spatial genes. Instead aberrant 2, appears caused deficient earlier stage. Furthermore, defects proliferation correlates presence morphologically modified mitochondria. putative causes consequences for discussed.