Abstract
The results of long-term studies on legume symbiogenetics and breeding are summarized by the example of pea Pisum sativum L. A collection of symbiotic mutants was developed by chemical and radiational mutagenesis of pea varieties and genetically characterized. Various sym genes were recognized. From the large set, supernodulating (proved to be recessive) and dominant hypernodulating types of symbiotic mutants were chosen for breeding programs. Varieties differed dramatically in hypernodulation degree. Aiming at nitrogen fixation intensification, accessions bearing recessive genes for supernodulation ( nod4 ) and dominant genes for hypernodulation ( Nod5 ) were selected. The recurrent method of symbiotic mutants utilization in pea breeding for nitrogen fixation intensification was developed. The best results were obtained by combining two sym genes in one pea genotype: the dominant hypernodulation gene Nod5 and the recessive supernodulation gene nod4 . A set of recurrent lines tagged with both these genes was raised to use in breeding programs as donors of intense nitrogen fixation combined with good performance. In addition, they are good preceding crops. After their harvesting, soil accumulates large amounts of nitrogen-rich root and bacterial biomass. The nitrogen is preserved for years, whereas mineral nitrogen is rapidly washed out with precipitation. Endemic pea accessions originated from various regions can be successful starting material in breeding for nitrogen fixation intensification, accessions from Egypt and Syria having provided best results. Nodulation and nitrogen fixation intensities were assessed in seven cultivars derived from three promising pea lines raised at the Siberian Research Institute of Plant Breeding and Selection.
Highlights
The results of long-term studies on legume symbiogenetics and breeding are summarized by the example of pea Pisum sativum L
A collection of symbiotic mutants was developed by chemical and radiational mutagenesis of pea varieties and genetically characterized
From the large set, supernodulating and dominant hypernodulating types of symbiotic mutants were chosen for breeding programs
Summary
Cимбиотическая фиксация атмосферного азота у бобовых растений как генетикоселекционный признак. Обобщены результаты многолетних исследований по симбиогенетике и селекции зернобобовых культур на примере гороха Pisum sativum L. Для разработки селекционных методов на повышение азотфиксации выбраны формы, маркированные рецессивными генами супернодуляции (nod4) и доминантными генами гипернодуляции (Nod). Разработан рекуррентный метод использования симбиотических мутантов в селекции гороха на повышение азотфиксации. Лучшие результаты получены при объединении в одном генотипе гороха двух sym-генов – доминантного гена гипернодуляции Nod и рецессивного гена супернодуляции nod. В настоящее время эти линии используются в селекции как доноры на повышение азотфиксации при хорошей продуктивности. Эндемичные формы гороха, происходящие из разных регионов, можно с успехом использовать в качестве исходного материала в селекции на повышение азотфиксации. Проведена оценка по нодуляции и активности азотфиксации 7 сортов трех перспективных линий гороха селекции СибНИИРС.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
