| To study the response of sugarcane hybrids under nutrient stress, four different varieties were used as
materials, including one BC3 from hybrids of sugarcane and Erianthus arundtnaceus, one BC1 from hybrids of
sugarcane and Saccharum spontaneum and two cultivated varieties. The plant growth, nutrient concentration and
nutrient accumulation amount were evaluated under low nitrogen stress, low phosphorus stress or low potassium
stress. The results revealed that plant height, diameter, dry weight of shoot and dry weight of root of four varieties all
decreased under low nutrient stress. The decrease in these parameters was lower in YC10-29 under low potassium
stress and YC06-92 under low phosphorus stress than those in the other two cultivated varieties. Under low nutrient
stress, the ratio between root and shoot increased and the diameter of root under low potassium or phosphorus stress
decreased, which lead to the increase of total root length, especially the total root length of YC06-92 under low
potassium stress, which was 2.67 times higher than that of CK. There were significantly interactions among different
nutrients under low nutrient stress. Under low potassium stress, the concentration of phosphorus in plant increased,
while the concentration of potassium and phosphorus increased under low nitrogen stress. In addition, the potassium
and phosphorus accumulation amount in plant under low nitrogen stress was higher than those under low potassium
and phosphorus袁especially in ROC22. Therefore, among four varieties, YC10-29 showed higher tolerance to low
potassium stress, YC06 -92 possessed excellently tolerance to low phosphorus stress and ROC22 showed higher
tolerance to low nitroge |
