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Registration of two Oryza sativa tropical japonica germplasm lines selected for panicle architecture and grain size traits
Author(s) -
Eizenga Georgia C.,
McClung Anna M.,
Huggins Trevis D.
Publication year - 2021
Publication title -
journal of plant registrations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.316
H-Index - 21
eISSN - 1940-3496
pISSN - 1936-5209
DOI - 10.1002/plr2.20145
Subject(s) - panicle , germplasm , biology , oryza sativa , japonica , inflorescence , cultivar , agronomy , allele , japonica rice , poaceae , horticulture , gene , botany , genetics
Abstract Two rice ( Oryza sativa L.) germplasm lines, SC14_166 (Reg. no. GP‐148, PI 698103) and SC14_072 (Reg. no. GP‐147, PI 698102), containing alleles for increased panicle branching, seeds per panicle, and grain length were developed by the USDA‐ARS. They are recombinant inbred lines selected from a cross of ‘Estrela’ (GSOR 301227) and NSFTV199 (GSOR 301190), both of tropical japonica origin. SC14_166 is a medium grain cultivar and contains alleles for two major genes, SPIKELET NUMBER on chromosome (chr.) 4 and FRIZZY PANICLE on chr. 7, which result in a greater number of primary branches, seeds per panicle, and panicle weight compared with the parents. SC14_072 is an extra‐long grain cultivar and contains alleles for two major genes on chr. 3, GRAIN SIZE 3 and GRAIN LENGTH 3.2 , resulting in greater grain length, width, thickness, and kernel weight. The germplasm lines possess Pi‐ks , whereas SC_072 also has Pi‐z , both of which are major genes for resistance to rice blast disease. These germplasm lines are well adapted to growing conditions in the southern United States and will benefit long‐grain and medium‐grain breeding programs that desire to increase grain dimensions and panicle architecture traits. Because they are derived from the tropical japonica subpopulation like most U.S. cultivars, they will be highly compatible for making breeding crosses and will contribute novel alleles to the gene pool.