Origin and developmental physiology of root nodules

Nutman, P. S.

doi:10.1007/978-3-642-50088-6_38

Cited by 6 publications

(2 citation statements)

References 86 publications

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“…They are also sensitive to higher salt concentration (Wilson 1994) and are capable of growing at 200 mM salt concentration, but the growth is more abundant at lower salt concentration (Rafiq 1997). Moreover, the inhibitory effects of other soil microorganisms such as bacteria, fungi and actinomycetes (Nutman 1965), toxic effects of fungicides, herbicides and other plant protectants as well as temperature affect the growth and survival of rhizobia (Subba Rao 1985;Islam and Dart 1975;Date 1989;Date and Ratcliff 1989).…”

Section: Introductionmentioning

confidence: 99%

Effect Of Rhizobium Inoculant On Nodulation, Yield And Yield Traits Of Chickpea (Cicer Arietinum L.) In Four Different Soils Of Greater Rajshahi

1970

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This study shows that enhancement of soil fertility along with the yield of chickpea due to nodulation by the Rhizobium is possible to some extent. Data on plant height (cm) at maturity, primary branches/plant, days to flower, pods/plant, pod dry weight/plant (g), seeds/pod, seed dry weight/pod (g), 50 seeds weight (g), nodules/plant, fresh weight of nodules/plant and dry weight of nodules/plant were considered to assess the effect of nodulation in chickpea. Soils treated with Rhizobium always showed higher values than control regarding total nitrogen and organic matter (%). Campus soil showed the highest value for organic matter (%) and N content but Cholonbil soil exhibited the highest value for number of seeds per pod. All the parameters for growth analysis yielded greater values for treated soils compared to that of the control.Key words: Rhizobium, nodulation, yield trait, chickpea, soil. mvivsk: GB cix ¶YwUi gva¨ ‡g †`Lv †M ‡Q †h, †Qvjv ‡Z ivB ‡Rvweqv ‡gi bwWD ‡jkb NwU ‡q gvwUi De© iZv e" w×i cvkvcvwk †Qvjvi Drcv`b e" w× m¤¢ e| †Qvjvi Dci bwWD ‡jk ‡bi cÖ fve cwigv ‡ci Rb¨ cỸ© Zv cÖ vß Dw™¢ ‡`i D"PZv ( †m.wg.), MvQ cÖ wZ cÖ v_wgK kvLv, dz j avi ‡Yi mgqKvj, MvQ cÖ wZ dj, MvQ cÖ wZ ï®‹ ex ‡Ri IRb (MÖ vg), 50wU ex ‡Ri IRb (MÖ vg), MvQ cÖ wZ bwWDj, MvQ cÖ wZ ZvRv bwWD ‡ji IRb (MÖ vg) Ges MvQ cÖ wZ ï®‹ bwWD ‡ji IRb (MÖ vg) Gi gvb we ‡ePbv Kiv n ‡q ‡Q| ivB ‡Rvweqvg wb ‡ewkZ gvwU me©vB bvB ‡Uª v ‡R ‡bi nvi Ges ˆRe c`v ‡_© i AvwaK¨ cÖk© b K ‡i| K¨v¤úv ‡mi gvwU ‡Z ˆRe c`v_© Ges bvB ‡Uª v ‡R ‡bi kZKiv nv ‡ii AvwaK¨ cÖwk© Z nq, wKš' Pjbwe ‡ji gvwUi † ¶ ‡Î dj cÖ wZ exR msL¨v AwaKfv ‡e cÖwk© Z n ‡q ‡Q| e" w×RwbZ mKj cwigvcK¸ ‡jvi gvb wbqwš¿ Z gvwUi Zz jbvq wb ‡ewkZ gvwU ‡Z AwaKgvÎvq cÖwk© Z n ‡q ‡Q|

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Section: Introductionmentioning

confidence: 99%

Effect Of Rhizobium Inoculant On Nodulation, Yield And Yield Traits Of Chickpea (Cicer Arietinum L.) In Four Different Soils Of Greater Rajshahi

1970

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“…Two explanations are given for the occurrence of tetraploid cells in root nodules. Either the tetraploid cells stem from a preexisting tetraploid cortical cell, which is selectively triggered by the infecting microorganism to divide (Wipf and Cooper, 1940;Nutman, 1965, many others), or the tetraploid cells stem from diploid cortical cells in which the chromosome complement was doubled by endoreduplication brought about by the infecting microorganism (Bhaskaran and Swaminathan, 1958;Kodama, 1968Kodama, ,1970. Torrey (1961) found that in pea root segments cultured on a synthetic nutrient medium auxins trigger divisions in diploid cells and auxins plus cytokinins in tetraploid cells.…”

Section: Materials and Methods-culture Methods-mentioning

confidence: 99%

Hormone-Induced Endoreduplication Prior to Mitosis in Cultured Pea Root Cortex Cells

Libbenga¹,

Torrey²

1973

American Journal of Botany

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One-mm-thick cortical explants excised aseptically from 10-11 mm behind the tip of 3-dayold roots of the garden pea, Pisum sativum, cv. 'Little Marvel' were cultured on a synthetic nutrient medium supplemented with auxin or auxin and cytokinin. Nuclear DNA contents were measured in cells of the explants at the outset and at specified times during culture up to seven days. Fixed and sectioned preparations were stained with the Feulgen method using the DNA-specific dye auramin-O. Fluorescent microspectro-photometric measurements of individual nuclei were made from each cortical population. At day zero all cortical nuclei measured were either 2c or 4c with respect to their DNA content. In the presence of the auxins, indoleacetic acid and 2,4-dichlorophenoxyacetic acid, and the cytokinin, kinetin, DNA values increased to multiples of the 2c level with populations at the 8c and 16c level predominating after three days of culture as well as at seven days. In the presence of auxins alone no change in DNA values was observed during three days. Kinetin concentrations as low as 0.01 ppm were already effective. The data are interpreted to show that cytokinin, in the presence of auxin, induces two rounds of DNA synthesis prior to the first mitoses, the first round being connected with chromosome doubling by endoreduplication and the second one with normal mitosis. From this we inferred that tetraploid cells in leguminous root nodules might have arisen in the same way, i.e., by endoreduplication prior to the first mitoses induced by the rhizobial division stimulus, unless the chromosome number of root cortical cells had already been doubled by endoreduplication in the normally differentiating root systems.

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Pollen. Symbionts and Symbiont-Induced Structures

Mascarenhas¹,

Canary²

1985

Hormonal Regulation of Development III

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Origin and developmental physiology of root nodules

Cited by 6 publications

References 86 publications

Effect Of <i>Rhizobium</i> Inoculant On Nodulation, Yield And Yield Traits Of Chickpea (<i>Cicer Arietinum</i> L.) In Four Different Soils Of Greater Rajshahi

Effect Of <i>Rhizobium</i> Inoculant On Nodulation, Yield And Yield Traits Of Chickpea (<i>Cicer Arietinum</i> L.) In Four Different Soils Of Greater Rajshahi

Hormone-Induced Endoreduplication Prior to Mitosis in Cultured Pea Root Cortex Cells

Pollen. Symbionts and Symbiont-Induced Structures

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