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Tian Y.,Hunan Agricultural University | Tian Y.,Hunan Agricultural Bioengineering Research Institute | Tian Y.,HIGH-TECH | Yang H.,Hunan Agricultural University | And 10 more authors.
Plant Growth Regulation | Year: 2010

Stamen is the male reproductive organ of rice (Oryza sativa L.), and the development is a considerably significant stage during the sexual reproduction. It is very important to reveal what is the molecular mechanisms which controlling the development of stamen, and will be helpful in producing hybrid seeds by manipulating the male sterility. This article reviews the progress on the molecular mechanisms of male reproductive organogenesis in rice, which would facilitate the further studies on male sterile genes in rice. © Springer Science+Business Media B.V. 2010. Source

Xing J.,Central South University | Xing J.,National Hybrid Rice Research and Development Center | Jia Y.,Dale Bumpers National Rice Research Center | Correll J.C.,University of Arkansas | And 4 more authors.
Plant Disease | Year: 2013

The Pi-ta gene deployed in southern U.S. rice germplasm is effective in preventing the infection by strains of Magnaporthe oryzae isolates that carry the avirulence (AVR) gene AVR-Pita1. In the present study, 169 isolates from rice (Oryza sativa) cultivars, with and without Pi-ta, were analyzed for their genetic identity using an international differential system, repetitive element-based polymerase chain reaction (Rep- PCR), and sequence analysis of PCR products of AVR-Pita1. These isolates belong to the races IA1, IB1, IB17, IC1, and IC17 of M. oryzae. These isolates were further classified into 15 distinct groups by Rep-PCR. There was a predominant group within each race. Pathogenicity assays on 'Katy' (Pi-ta) and 'M202' (pi-ta) rice determined that IC1 was virulent to Katy and M202; IB17, IC17, and most of IA1 and IB1were avirulent to Katy and virulent to M202, suggesting that the Pi-ta gene in Katy is responsible for preventing infection by these isolates. Consistently, AVR-Pita1 was not amplified from 28 virulent isolates. One AVR-Pita1 allele was amplified by AVR-Pita1-specific primers in 78 avirulent isolates. Interestingly, different AVR-Pita1 alleles were found in each of the 12 avirulent isolates, as determined by DNA sequencing. Sequence analysis of 90 PCR products revealed 10 AVR-Pita1 haplotypes, 4 of which were new. In total, 12 amino acid changes were identified in the new variants when compared with the first described AVR-Pita sequence (AF207841). The finding of isolates with altered AVR-Pita1 from rice cultivars with and without Pi-ta suggests that these virulent isolates were adapted to the field environments in the southern United States. Further research will be needed to verify this prediction. Source

Song S.,CAS Institute of Subtropical Agriculture | Song S.,University of Chinese Academy of Sciences | Li L.,National Hybrid Rice Research and Development Center | Yang X.,CAS Institute of Subtropical Agriculture | And 6 more authors.
Plant Breeding | Year: 2012

With 6 figures and 4 tables Heterosis refers to the phenomenon in which the hybrid progeny of two inbred varieties exhibits enhanced growth or agronomic performance. Although a century-long history of research has generated several hypotheses regarding the genetic basis of heterosis, the molecular mechanisms underlying heterosis and heterotic gene activity remain elusive. In this study, two rice heterotic crosses PA64S×93-11 and Y58S×93-11 were used as plant materials to analyse the activities of 10 abiotic stress-responsive genes under cold, heat and drought stresses by quantitative real-time PCR. The obtained result demonstrated that the expression levels of genes analysed in hybrids is unexpectedly higher, compared to those of both parental lines. More than 50% of the cases displayed over-parent expression levels. The combined allelic expression pattern was found in hybrid, and under different stress conditions, different alleles were differentially expressed in hybrid. © 2012 Blackwell Verlag GmbH. Source

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