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By Te-Tzu Chang

"The Rice Genetics assortment" of previous symposia and different chosen literature includes approximately 4,400 pages of searchable details on rice genetics and cytogenetics released by way of the IRRI and its companions considering 1964. as well as the 5 genetics symposia held at 5-year periods in view that 1985, the gathering comprises vintage guides that kicked off major reporting on those topics within the early Nineteen Sixties. This assortment is a complete and historic documentation almost about rice genetics, spanning forty five years of study and scholarly work.This technical bulletin at the "Present wisdom of Rice Genetics and Cytogenetics", written in 1964 by means of the past due Te-Tzu Chang, a well known geneticist, supplied the 1st attempt to collect in a single medium the voluminous multilanguage literature on those vital topics. It includes seven chapters on subject matters facing the Oryza species and species relationships; the starting place and indigenous heart of cultivated rices; cytological and cytogenetical reports, and their review on the subject of rice breeding; geographical teams of cultivated rices and intervarietal hybrid sterility in Oryza sativa; and components requiring new or renewed learn efforts.

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O. stapfii O. sativa x. O. stapfii O. sativa x. O. officinalis 12 II (140, 210, 248) 12 II or 2-24 I (406,17) 12 II (140, 210, 248, 162) 12 II or 2-24 I (406) 12 II (248,143, 17) 12 II or 2-24 I (406) 24 I ( 245 , 295, 210, 248, 357) O. sativa x. O. australiensis 24 I (210, 248, 355) O. sativa x O. australiensis 22 I + 1 II (cf . 156) 1 PF-F (405) PF-F (405) PS-F (140, 210, 248, 162) PS-PF (405) PF-F (405) S (140, 210, 248 342 PS-S (406, 17) S-PS (140, 210, 248,162) PS-S (406) S (248, 17) S (406) S (245, 295, 210 248, 357 ) S (210, 248) – Author’s designation of species name is followed.

Probable number of genes Plant organ 1. 2. 5 Leaf sheath Leaf blade 3 to 6 3. Internode 4. Junctura 5. Leaf axil 3 to 5 2 2 to 4 6. Ligule 7. Auricles 3 to 4 2 8. Pulvinus 2 2 9. Septum 10. 11. Outer glumes Lemma and palea 2 to 5 4 to 5 12. Apiculus 4 to 5 13. Stigma 5 to 7 3 14. Awn Kadam of India postulated that a total of eleven genes accounted for all the color segregations that occurred in three crosses (cf. Jodon 1955). However, 1 the applicability of the C-A-P complementary gene system in pigment formation among tropical varieties has been confirmed by Kondo (1963a) and Ghose et al.

Perennis has been suggested as a source of tolerance to water-logging and for improving deep-water rice; O. officinalis as a source for tolerance to deep flood; O. perennis var. longistaminata and O. sativa f. spontanea as gene-pools to provide drought resistance; O. perennis var. cubensis to provide resistance to Helminthosporium oryzae; O. coarctata as a source of resistance to salinity; O. ridleyi from Malaya to provide resistance to stem - 49 borers; and O. glaberrima as a promising source of enhanced adaptability to low soil fertility and of improved grain quality (Ramiah and Ghose 1951, Chalam 1959, Richharia et al.

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