大麦抗白粉病近等基因系农艺性状相似性的评价

SIMILARITY OF GENETIC BACKGROUND BETWEEN BARLEY ISOGENIC LINES CARRYING VARIOUS GENES FOR POWDERY MILDEW RESISTANCE AS DETERMINED BY ANALYZING SEVEN QUANTITATIVE CHARACTERS

To evaluate the extent of genetic similarity between paired isogenic lines carrying various genes for powdery mildew resistance, we tested the reaction of 10 pairs of barley isogenic lines to powdery mildew and examined 7 quantitative characters including heading date, flowering date, plant height, tillers/plant, spike length , number of seed-setting spikelets per head and kernel weight. The results showed that the disease level is high on the susceptible line, and low on the resistant line in all the 10 pairs of isogenic lines. There were highly significant differences in heading date, flowering date, plant height and number of seed-setting spikelets per head among different pairs of isogenic lines. No significant difference was detected in any of these 7 characters between the two lines within each isogenic pair. The results clearly demonstrated that the genetic background was highly uniform between the resistant and susceptible lines within each of the 10 pairs of the isogenic lines.