棉 花 学 报     Cotton Science   2008，20(1)：76-78

Preliminary Observation on Morphological Parameters of Root System of the Root-naked Transplanting Cotton （ Gossypium hirsutum L.）
MAO Shu-chun，LI Peng-cheng，HAN Ying-chun，WANG Guo-ping，LI Ya-bing，WANG Xiang-he
(Cotton Research Institute, CAAS, Key Lab of Cotton Genetics Improvement，Ministry of Agriculture, Anyang, Henan 455000, China)

Abstract:The morphological parameters of the adult plant root system of the root-naked transplanting cotton (RNTC) was compared in the fields with the soil-cubes transplanting cotton (SCTC) and the direct seeding cotton (DSC) by observing the distribution of root system at each soil profile in layer 0-170 cm. Results showed that lateral roots of RNTC grew actinomorphicly, there about six to eigth dominant thick and strong lateral roots. Lateral roots of SCTC spread anisomerously to one side like the paw of a chicken, with about one to two or two to three dominant lateral roots. The root system of DSC was typical taproot system. The survey indicated that mean numbers of primary lateral roots of RNTC was 44 per plant, more than SCTC and DSC by 15.8% and 37.5% each( F=33.24 ＞ F_0.01=5.49). Mean diameter width of the primary lateral roots of RNTC was 0.31 cm, wider than SCTC and DSC by 20.5% and 88% each (F=249.01 ＞ F_0.01=5.49); Mean dry weight of whole root system of RNTC was 31.9 g·plant^-1, heavier than SCTC and DSC by 22.2% and 75.3% each (F=84.31 ＞ F_0.01=5.49).
Key words: G.hirsutum L.; root system; plant growth regulator; complete distribution at soil profile
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