title: [Effects of tillage at pre-planting of winter wheat and summer maize on leaf senescence of summer maize].
abstract: This study explored the effects of different tillage treatments at pre-planting winter wheat and summer maize on leaf senescence physiological characteristics of summer maize in double cropping system. Zhengdan 958 was used as experimental material. Three tillage treatments, including rotary tillage before winter wheat seeding and no-tillage before summer maize seeding (RN), mold- board plow before winter wheat seeding and no-tillage before summer maize seeding (MN), and moldboard plow before winter wheat seeding and rotary tillage before summer maize seeding (MR), were designed to determine the effects of different tillage treatments on leaf area (LA) , leaf area reduction, photosynthetic pigments content, superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activities and malondialdehyde (MDA) content in ear leaves of summer maize after tasselling (VT). LA of MN and MR were higher than that of RN from VT to 40 days after tasseling (VT + 40) and LA reduction of MR was the highest after VT + 40. As for MR, MN and NT, the photosynthetic pigments content got the maximum value at 20 days after tasselling (VT + 20) and then decreased, following the change of unimodal curve. At VT + 20, the contents of chlorophyll a in MR and MN were increased by 11.4% and 9.7%, the contents of chlorophyll b in MR and MN were increased by 14.9% and 15.9%, compared with RN. The soluble protein content in ear leaves decreased following the growth process in all treatments, and that of MR and MN remained 11.5% and 24.4% higher than that of RN from VT to VT + 40. SOD, CAT and POD activities of three treatments got the maximum values at VT + 20 and then decreased, following the change of unimodal curve. MDA content increased following the growth process in all treatments and that of RN always remained at high levels. Grain yields of MN and MR were 24.0% and 30.6% greater than that of RN, respectively. Grain yield of MR was 5.2% higher than that of MN. In conclusion, the ability of leaf senescence resistance of MN was improved, which was helpful to increase the yield of summer maize.
authors.forename: Xia
authors.initials: X
authors.lastname: Li
authors.forename: Ji-wang
authors.initials: JW
authors.lastname: Zhang
authors.forename: Bai-zhao
authors.initials: BZ
authors.lastname: Ren
authors.forename: Xia
authors.initials: X
authors.lastname: Fan
authors.forename: Shu-ting
authors.initials: ST
authors.lastname: Dong
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.forename: Bin
authors.initials: B
authors.lastname: Zhao
mesh_terms: D000383:Agriculture / Q000379:methods*; D002374:Catalase / Q000378:metabolism; D002734:Chlorophyll / Q000032:analysis; D008315:Malondialdehyde; D010544:Peroxidases / Q000378:metabolism; D010788:Photosynthesis; D018515:Plant Leaves / Q000502:physiology*; D013482:Superoxide Dismutase / Q000378:metabolism; D014908:Triticum / Q000254:growth & development*; D003313:Zea mays / Q000502:physiology*
chemical_list: D002734:Chlorophyll; D008315:Malondialdehyde; D010544:Peroxidases; D002374:Catalase; D013482:Superoxide Dismutase