Abstract:
:It was previously reported that the hypernodulating soybean (Glycine max [L.] Merr.) mutants, derived from the cultivar Williams, had higher root concentration of isoflavonoid compounds (daidzein, genistein, and coumestrol) than did Williams at 9 to 12 days after inoculation with Bradyrhizobium japonicum. These compounds are known inducers of nod genes in B. japonicum and may be involved in subsequent nodule development. The current study involving reciprocal grafts between NOD1-3 (hypernodulating mutant) and Williams showed that root isoflavonoid concentration and content was more than twofold greater when the shoot genotype was NOD1-3. When grafted, NOD1-3 shoots also induced hypernodulation on roots of both Williams and NOD1-3, while Williams shoots induced normal nodulation on both root genotypes. This shoot control of hypernodulation may be causally related to differential root isoflavonoid levels, which are also controlled by the shoot. In contrast, the nonnodulating characteristic of the NN5 mutant was strictly root controlled, based on reciprocal grafts. Delayed inoculation (7 days after planting) resulted in greater nodule numbers on both NOD1-3 and Williams, compared with a seed inoculation treatment. The nodulation pattern of grafted plants was independent of whether the shoot portion was derived from inoculated seed or uninoculated seed, when grafted at day 7 onto seedling roots derived from inoculated seed. This observation, coupled with the fact that no difference existed in nodule number of NOD1-3 and Williams until after 9 days from seed inoculation, indicated that if isoflavonoids play a role in differential nodulation of the hypernodulating mutant and the wild type, the effect is on advanced stages of nodule ontogeny, possibly related to autoregulation, rather than on initial infection stages.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Cho MJ,Harper JEdoi
10.1104/pp.96.4.1277subject
Has Abstractpub_date
1991-08-01 00:00:00pages
1277-82issue
4eissn
0032-0889issn
1532-2548journal_volume
96pub_type
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