Premium
Transfer of Powdery Mildew Resistance from Helianthus debilis Nutt. to Cultivated Sunflower 1
Author(s) -
Jan C. C.,
Chandler J. M.
Publication year - 1985
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1985.0011183x002500040020x
Subject(s) - powdery mildew , biology , helianthus annuus , sunflower , backcrossing , cultivar , plant disease resistance , mildew , agronomy , helianthus , leaf spot , horticulture , botany , gene , biochemistry
Powdery mildew ( Erysiphe cichoracearum ) of sunflower is a disease which can have a serious economic impact when the crop is grown in warmer regions. An accession of H. debilis ssp. debilis Nutt. (2n=34) found to be highly resistant to sunflower powdery mildew at Davis, CA was used in a program to transfer resistance to the cultivated sunflower, Helianthus annuus L. (2n=34). Plants of the wild accession were pollinated by the susceptible H. annuus cv. Peredovik and line P21. The F 1 plants were backcrossed once with P21 and the BC 1 F 1 plants were selfpollinated, sib‐pollinated, or further backcrossed with P21. Disease evaluations on all tested plants were conducted in a greenhouse under cool temperature and high humidity using previously infected, susceptible plants as the source of inoculum. Infection was measured as the percent of leaf surface covered by mildew. The mean infection percentages of P21, the F 1 and H. debilis were 100, 15, and 0, respectively. Resistance was incompletely dominant in the F 1 and backcross progenies. This source of disease resistance may enable the production of resistant hybrid cultivars suitable for warmer regions.