摘要
为明确不同类型水稻品种的响应规律,为水稻高产稳产、安全生产提供依据。在盆栽土培条件下,研究了5种1,2,4-三氯苯(TCB)浓度(0、10、20、40、80 mg kg^(–1)土)对2个水稻品种(宁粳1号,敏感;扬辐粳8号,耐性)灌浆期剑叶光合特性与产量的影响。结果表明,TCB的影响品种间差异显著。低浓度TCB(10 mg kg^(–1))下,扬辐粳8号的株高、鲜重和产量显著增加,叶绿素含量、净光合速率、胞间CO2浓度、蒸腾速率和qN略有升高,但与对照的差异不显著,而F_v/F_m和F_v/F_o略有下降;宁粳1号的净光合速率、胞间CO2浓度、蒸腾速率、Φ_(PSII)、F_v/F_m、F_v/F_o、qp和产量略有下降,气孔导度显著降低。在20 mg kg^(–1) TCB处理下,宁粳1号的光合参数、产量、株高、地上部和地下部鲜重均显著降低,而扬辐粳8号略有降低,表现出较强耐性;在中高浓度TCB(40 mg kg^(–1),80 mg kg^(–1))处理下,2个水稻品种的光合特性、株高、鲜重和产量均受显著抑制,且以宁粳1号的降幅较大。TCB对水稻光合特性与产量的影响不仅与其浓度有关,且存在显著品种间差异,耐性水稻品种表现出低浓度TCB处理对其株高、鲜重、叶绿素含量、光合特性及其产量有一定的促进作用,在中高浓度TCB处理时表现出较强的耐性,受胁迫程度小。
A pot experiment was conducted, using two rice cultivars Ningjing 1 （TCB sensitive） and Yangfujing 8 （TCB tolerant）, with five concentration treatments （0, 10, 20, 40, and 80 mg TCB per kg dry soil） to explore the responses of two rice cultivars to TCB, and provide the basis for the high, stable, and safe production of rice. The results indicated that significant differences were found in the effects of TCB treatments on grain yield and photosynthetic parameters of flag leaf between the two cultivars. Plant height, fresh weight, and yield were significantly increased, chlorophyll content, net photosynthetic rate, intercellular CO2 con- centration, transpiration rate, and qN were slightly increased, while Fv/Fm and Fv/Fo were slightly decreased in the low TCB concentration （10 mg kg^–1） treatment of Yangfujing 8. Under the same condition, the net photosynthetic rate, CO2 intercellular concentration, transpiration rate, ~Psn, Fv/Fm, Fv/Fo, qp, yield in Ningjing 1 were slightly declined with significant reduction of stomatal conductance. The photosynthetic characteristics, yield, plant height, fresh weight in Ningjing 1 were decreased significantly, while Yangfujing 8 showed more resistance and adaptation to TCB at 20 mg kg^–1. Both cultivars showed significant decrease in growth, photosynthesis and yield in treatments with high TCB concentrations （40 and 80 mg kg^–1）, with the greater decrements in Ningjing 1. The effect of TCB on photosynthetic characteristics and yield of rice was not only related to TCB concentration, but also to cultivars. Low TCB levels slightly promoted the plant height, fresh weight, chlorophyll content, photosynthetic characteristics and rice yield in Yangfujing 8 that showed stronger tolerance to TCB than Ningjing 1, under high TCB concentrations （40 and 80 mg kg^–1）.
出处
《作物学报》
CAS
CSCD
北大核心
2016年第2期255-264,共10页
Acta Agronomica Sinica
基金
国家自然科学基金项目(31271639)
国家公益性行业(农业)科研专项(201303102)资助~~
关键词
水稻品种
灌浆期
1
2
4-三氯苯
光合特性
产量
Rice cultivar
Grain-filling stage
1,2,4-three chlorobenzene
Photosynthetic characteristics
Yield
