Root Morphological and Physiological Characteristics of Sugarcane Stubble Cutting Height
Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2019, Vol. 40 ›› Issue (9): 1671-1676.DOI: 10.3969/j.issn.1000-2561.2019.09.001

• Crop Culture and Nutrition, Genetic Breeding •     Next Articles

Root Morphological and Physiological Characteristics of Sugarcane Stubble Cutting Height

FAN Xian,YANG Shaolin,LI Rudan,QUAN Yiji,DENG Jun,ZHANG Yuebin()   

  1. Sugarcane Research Institute, Yunnan Academy of Agricultural Sciences / Key Laboratory of Sugarcane Genetic Improvement of Yunnan Province, Kaiyuan, Yunnan 661699, China
  • Received:2019-01-20 Revised:2019-04-28 Online:2019-09-25 Published:2019-09-10
  • Contact: YANG Shaolin,ZHANG Yuebin

Abstract:

Our objective was to determine the effect of sugarcane stubble cutting height on the root morphological and physiological characteristics during stem elongation stages. Four stubble cutting heights were tested on cultivar CYZ 07-2800: 5 cm stubble cutting height above soil surface (control), and three stubble cutting heights at or below the soil surface (0-5-10 cm). Stubble cutting height treatments significantly affected the aboveground and belowground sugarcane growth and physiology. The aboveground biomass, root length, root surface area, and root volume of the -5 cm treatment increased significantly compared to of the other treatments (P<0.01) at mid and late elongation. The concentration of malonaldehyde (MDA) in the root was in the order 5 cm >-5 cm > 0 cm >-10 cm, while the activities of superoxide dismutase (SOD), peroxidase (POD), and nitrate reductase (NR) were in the order: 5 cm < 0 cm <-5 cm <-10 cm. The activities of SOD and POD tended to increase with elongation period. The -5 cm treatment increased the growth and physiological attributes of the root system, presumably increasing nutrient use efficiency and delaying root senescence. Due to continuous improvement in mechanical harvesting of sugarcane and limited ratooning ability, harvesting of sugarcane or post-harvest stubble cutting at 5 cm below soil was used to manage the ratoon crop, which significantly increased the yield and a prospect of large-scale adaptation of technology at farmers’ level.

Key words: sugarcane, root system, morphology, physiology, stubble cutting height