نتایج جستجو برای: sterility

تعداد نتایج: 5233  

Journal: :The Journal of heredity 2007
H Allen Orr J P Masly Nitin Phadnis

Study of the genetics of speciation--and especially of the genetics of intrinsic postzygotic isolation-has enjoyed remarkable progress over the last 2 decades. Indeed progress has been so rapid that one might be tempted to ask if the genetics of postzygotic isolation is now wrapped up. Here we argue that the genetics of speciation is far from complete. In particular, we review 2 topics where re...

Journal: :Genetics 2003
E M East J B Park

353 INTRODUCTION ................................................................. Historical ...................................................................... 354 Pollen-tube growth in artificial media. 356 Attempts to self-pollinate mutilated pistols. 358 Pollen-tube growth in the pistil.. 359 SUMMARY AND DISCUSSION ...................................................... 362 LITERATURE CI...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2000
C T Ting S C Tsaur C I Wu

Molecular differentiation between races or closely related species is often incongruent with the reproductive divergence of the taxa of interest. Shared ancient polymorphism and/or introgression during secondary contact may be responsible for the incongruence. At loci contributing to speciation, these two complications should be minimized (1, 2); hence, their variation may more faithfully refle...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2007
Ajay Pal S Sandhu Ricardo V Abdelnoor Sally A Mackenzie

Stability of the mitochondrial genome is controlled by nuclear loci. In plants, nuclear genes suppress mitochondrial DNA rearrangements during development. One nuclear gene involved in this process is Msh1. Msh1 appears to be involved in the suppression of illegitimate recombination in plant mitochondria. To test the hypothesis that Msh1 disruption leads to the type of mitochondrial DNA rearran...

2016
Liying Meng Zihan Liu Lingli Zhang Gan Hu Xiyue Song

Male sterility is an important tool for obtaining crop heterosis. A thermo-sensitive cytoplasmic male-sterile (TCMS) line was developed recently using a new method based on tiller regeneration. In the present study, we explored the critical growth stages required to maintain thermo-sensitive male sterility in TCMS lines and found that fertility is associated with abnormal tapetal and microspore...

2015
Shuping Wang Gaisheng Zhang Yingxin Zhang Qilu Song Zheng Chen Junsheng Wang Jialin Guo Na Niu Junwei Wang Shoucai Ma

Plant male sterility has often been associated with mitochondrial dysfunction; however, the mechanism in wheat (Triticum aestivum L.) has not been elucidated. This study set out to probe the mechanism of physiological male sterility (PHYMS) induced by the chemical hybridizing agent (CHA)-SQ-1, and cytoplasmic male sterility (CMS) of wheat at the proteomic level. A total of 71 differentially exp...

2013
A. A. PICKETT

The development of F1 hybrid varieties of wheat is reviewed under four main headings: male sterility, hybrid seed production, the performance of hybrids and commercial aspects. The three systems for male sterility used in wheat (cytoplasmic male sterility, nuciear male sterility and chemical hybridizing agents) are described and it is noted that no system is without problems or has a clear adva...

Journal: :The Plant cell 1992
D Worrall D L Hird R Hodge W Paul J Draper R Scott

Male sterility in a petunia cytoplasmic male sterile line has been attributed to the early appearance of active callase, a beta-1,3-glucanase, in the anther locule. This leads to premature dissolution of the callose walls surrounding the microsporogenous cells. We have mimicked this aspect of the petunia line in transgenic tobacco by engineering the secretion of a modified pathogenesis-related ...

Journal: :Genetics 1978
W L French

Analysis by a progeny test system has permitted the selection for different cytoplasmic sterility factors in two strains of mosquitoes derived from the progeny of a single female. Reciprocal interstrain crosses show full fertility and viability. However, testcrosses to a third cytoplasmic type show highly significant, reproducible differences in the cytoplasmic systems of the selected strains. ...

Journal: :PLoS Biology 2007
John P Masly Daven C Presgraves

Postzygotic reproductive isolation is characterized by two striking empirical patterns. The first is Haldane's rule--the preferential inviability or sterility of species hybrids of the heterogametic (XY) sex. The second is the so-called large X effect--substitution of one species's X chromosome for another's has a disproportionately large effect on hybrid fitness compared to similar substitutio...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید