OAR@ICRISATNatural occurrence and salient characters of nonnodulating chickpea plantsO PRupelaauthorNonnodulating (Nod−1) lines are a valuable reference for assessing the amount of biologically fixed N2 in a legume. Chance observation of a Nod~ plant in chickpea (Cicer arietinum L.) accession ICC 435 encouraged us to study the frequency of natural occurrence of this trait. Six hundred forty to 36260 plants of each of 11 chickpea accessions, field-grown under conditions favoring good nodulation, were uprooted for nodulation observations at 22 and 112 days after sowing (DAS). Plants identified as Nod- at 22 DAS were potted to produce seeds and those at 112 DAS had physiologically mature seeds. Progenies of apparent Nod- plants were inoculated with chickpea Rhizobium strain 1C 59 and grown in pots for 28 d for confirmation. The frequency of Nod- plants in four accessions (ICC 435, −4918, −5003 and −4993) ranged from 120 to 490 per million. One Nod- plant from each of the four accessions was used for reconfirmation studies in the postrainy season 1987-1988 and for agronomic evaluation in subsequent studies under field conditions. The Nod- selections were indistinguishable from their respective parent accessions for plant growth except for nodulation, and most yielded similarly to their Nod* accessions when supplied with 50 to 100 kg N ha−1. On a low-N field without fertilizer N, the Nod− plants were light green, grew poorly, had a short internodal distance with small leaves and leaflets, and had reddish-brown pigment on margins of leaflets, rachis, and sometimes branches. Chickpea1992Crop Science Society of AmericaArticle

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