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COMPARISON OF TETRAPLOID AND SINGLE GENE‐INDUCED GIGAS VARIANTS IN CHICKPEA (CICER ARIETINUM). I. ORIGIN AND GENETIC CHARACTERIZATION
Author(s) -
Davis Thomas M.,
Matthews Leslie J.,
Fagerberg Wayne R.
Publication year - 1990
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1990.tb13558.x
Subject(s) - biology , guard cell , mutant , ploidy , botany , pollen , polyploid , plant stem , colchicine , gene , germination , genetics
Two genetic variants with increased organ size were independently derived from diploid (2 n = 2 x = 16) chickpea ( Cicer arietinum L.) line ICC 640. Radiation‐induced mutant PM1101 had greatly enlarged leaves, leaflets, and pods, and an elongated stem with longer internodes but fewer nodes than ICC 640. F 1 , F 2 , and F 3 data from crosses with ICC 640 showed that the mutant characteristics of PM1101 were the pleiotropic effects of a single, recessive genetic factor. For purposes of comparison, tetraploid derivatives of ICC 640 were produced by colchicine treatment of seed. In the tetraploids, leaflets and pods were enlarged, but less dramatically than in PM1101. Enlarged pollen grains and stomatal guard cells, and increased guard cell chloroplast number were found in tetraploids but not in PM1101, while both variants produced fewer seeds than ICC 640. Mutant PM1101 and the tetraploids represent two very different manifestations of gigantism in chickpea.