Registration of A20 soybean germplasm resistant to brown stem rot, soybean cyst nematode, and iron deficiency chlorosis.

Reference Report for IND92020145

Title:	Registration of A20 soybean germplasm resistant to brown stem rot, soybean cyst nematode, and iron deficiency chlorosis.
Authors:	Tachibana, H., Mansur, L.M., Niblack, T.L., Schultz, S.P., Ruff, R., Bidne, K.G., Cianzio, S.R., Fehr, W.R.
Source:	Crop Sci. 1991, 31(6):1713-1714
Abstract:	Originating as an F3 selection from the cross BSR101 X CN210, the soyabean (Glycine max) germplasm A20 (PI549112) was released in 1990 because of its combined resistance to Phialophora gregata, Heterodera glycines race 3, Fe-deficiency chlorosis on calcareous soils (IDC) and Phytophthora megasperma f.sp. glycinea (conditioned by the Rps1a gene from BSR101). A20 is of maturity group II and has purple flowers, gray pubescence, tan pods at maturity and shiny yellow seeds with buff hila. Compared with BSR101 (resistant to P. gregata) A20 is 3 days later, has a 12% lower seed yield and shows similar resistance to P. gregata and IDC. Compared with cv. Bell (resistant to H. glycines) A20 matures 2 days later and has a 6% greater yield in trials conducted under multiple disease conditions in Iowa. A20 has similar seed quality to Bell, but seeds are smaller (16 mg per seed) and contain 2.3% less protein and 0.1% less oil

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