目录
摘要Ⅲ
关键词Ⅲ
AbstractⅣ
引言
引言1
1材料与方法1
1.1试验设计1
1.2测定项目与方法1
1.2.1叶片光合速率的测定1
1.2.2地上部生物量和叶面积的测定1
1.2.3铃数的调查1
1.2.4根系相关指标的测定1
1.3数据分析与统计方法2
2结果与分析2
2.1对棉花叶面积的影响2
2.2对棉花光合速率的影响3
2.3对棉花根系活力的影响3
2.4对棉花营养器官生物量积累的影响4
2.4.1对棉花根系生物量的影响4
2.4.2对棉花茎生物量的影响5
2.4.3对棉花叶生物量的影响6
2.5对棉花生殖器官生物量积累的影响7
2.5.1对棉铃生物量和铃数的影响7
2.5.2对棉花蕾花铃总重的影响9
2.6对棉花根冠关系的影响10
2.6.1对棉花根系载铃量的影响10
2.6.2对棉花根系载荷能力的影响11
3讨论13
3.1花铃期土壤干旱对棉花光合能力的影响13
3.2花铃期土壤干旱对棉花营养器官生物量积累的影响13
3.3花铃期土壤干旱对棉花生殖器官生物量积累的影响14
3.4花铃期土壤干旱对棉花根冠关系的影响14
致谢16参考文献17
花铃期土壤干旱对棉花根系载铃能力的影响
摘 要
干旱是棉花生长发育过程中的首要逆境胁迫因子，其会导致棉花产量降低，品质变劣。本研究以棉花品种德夏棉1号（耐旱品种）和豫早棉9110（干旱敏感品种）为材料，通过在花铃期施加不同（土壤相对含水量（SRWC）维持在（75±5）%、（60±5）%和（45±5）%三个水平）的土壤水分处理，研究花铃期持续土壤干旱下棉花生育动态、各器官生物量积累的变化规律。结果表明：（1）土壤干旱导致棉花光合速率下降，叶面积扩展受限，棉花的光合能力显著下降。（2）随土壤干旱 *51今日免费论文网|www.51jrft.com +Q: ^351916072^ 
胁迫程度的加深，棉株根系活力下降，且干旱胁迫程度越深，根系活力下降幅度越大。（3）随土壤干旱胁迫程度的加深，棉株各器官干物质积累量降低，且生物量向生殖器官的分配比例下降，蕾铃脱落率增加。（4）花铃期持续土壤干旱会降低棉花的根系载铃量和根系载荷能力，且加剧地上部和地下部、营养器官和生殖器官的生理不协调性。
EFFECTS OF SOIL DROUGHT DURING FLOWERING AND BOLLFORMING STAGE ON BOLLCARRYING CAPACITY OF COTTON ROOT SYSTEM
ABSTRACT
Drought is the primary stress factor in the growth and development of cotton. It will lead to cotton yield loss and quality deterioration. In this study, the cotton varieties Dexiamian 1 (droughttolerant variety) and Yuzaomian 9110 (droughtsensitive variety) were used as materials. Different soil water treatments were established (soil relative water content (SRWC) (75±5)%, (60±5)% and (45±5)%) at the flowering and bollforming stage. The cotton growth dynamics and biomass accumulation of different organs were studied. The results were as follows: (1) soil drought reduced the photosynthetic rate of cotton, limited the expansion of leaf area, and reduced the photosynthetic capacity of cotton significantly. (2) with the decreasing of SRWC, the root activity decreased. (3) with the decreasing of SRWC, the dry matter accumulation in all organs of cotton plant decreased, the proportion of biomass to reproductive organs decreased, and the rate of bud and boll abscission increased. (4) the continuous soil drought at flowering and bollforming stage could decrease the bollcarrying capacity of cotton root system, and make the physiological disharmony of aboveground and belowground parts, vegetative organs and reproductive organs deeper.
KEY WORDS：Cotton；Drought stress；Bollcarrying capacity；Flowering and bollforming stage；Rootshoot relationship

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