【作者】 翟立超；

【导师】 张永江； 李存东；

【作者基本信息】 河北农业大学 ， 作物栽培学与耕作学， 2012， 硕士

【摘要】 本试验以转基因抗虫棉国欣棉6号(2010)和农大棉8号(2011)为材料,进行大田试验,设置了2个播期和4个去早果枝方式(去掉基部1个、2个、3个果枝及不去果枝的对照)处理,研究了去早果枝对转基因抗虫棉生长生理的调控作用。旨在探寻去早果枝技术对棉花早衰的调控机理,为生产上棉花早衰的防控提供技术指导和理论支持。试验结果表明:1.去掉早期果枝后,推迟了棉花的生育进程,去早期果枝越多,推迟时间越长。2个播期中R1,R2和R3处理的生育期均比对照分别推迟3d,6d和9d。适量去除早期果枝有利于棉花在最佳开花结铃期内开花结铃,充分利用最佳开花结铃期内的光热资源。2.去掉早期果枝后增加了早播棉花的株高、茎粗和叶面积指数。2010年第1播期中,R1,R2和R3的株高均显著高于对照,但在第2播期中去早果枝处理与对照相比,差异不明显;2011年各处理的株高也均无明显差异;各去早果枝处理的茎粗在2年试验的第1播期中虽然高于对照,但差异未达显著性水平;在2年试验的第1播期中,R1,R2和R3的叶面积指数在生育后期(8月20日以后)均显著高于对照,但在第2播期,各处理间差异未达到显著性水平。3.适量去除早期果枝后,早播棉田果枝数和果节数不减或略有增加,节枝比提高,有助于塑造棉花合理株型。果枝数R1处理2年2个播期均表现与对照相当,R3处理则显著低于对照。各处理间的果节数差异不显著。节枝比R1、R2、R3处理在2010年第1播期显著高于对照,其余处理差异不显著。去掉早期果枝后,由于中后期营养条件的改善,增加了棉花的成铃率并降低了脱落率和烂铃率。对于第1播期,去早果枝处理能提高单株结铃数,且在2011年达差异显著水平,对于第2播期,去早果枝处理的单株结铃数降低,但与对照差异不显著。第1播期的去早果枝处理脱落率明显降低,但第2播期各处理表现升降不一,年度之间表现也不一致,但差异不显著。无论第1播期还是第2播期,去早果枝处理能显著降低单株烂铃率。4.去早果枝处理均明显提高了早播棉中后期的单株干物质积累量和营养器官干物质分配率,但在第2播期中各处理间差异不显著;各处理的生殖器官干物质积累量和分配率也无明显差异。去掉早期果枝后,由于后期仍保持一定的营养生长,干物质积累量较高,能在一定程度上缓解棉花早衰的发生。5.去掉早期1个果枝能够提高早播棉后期叶绿素含量并改善光合性能。2年试验均表明,适期早播的情况下,去掉早期1个果枝有利于提高棉花生育后期主茎功能叶叶绿素的含量,其中R1表现明显,但在第2播期各处理间均无明显差异;2010年第1播期中,R1的Chl a/b在8月20日和9月5日均显著高于对照,在2011年各处理间的差异均未达到差异显著性水平。6.去掉早期果枝后(1个或2个)能够改善早播棉中后期氮代谢水平,促进蛋白质的合成。2010年各处理的蛋白质含量在7月3日左右达到最大值,而2011年各处理均在7月18日左右达到最大值。在2010年第1播期中,R1的蛋白质含量在棉花生育后期(8月20日和9月5日)显著高于对照,第2播期中各处理间的差异均未达到显著性水平;2011年第1播期中,R1和R2的蛋白含量最大值均极显著高于对照,其余各处理间差异不明显。7.去掉早期果枝后,由于同化合成能力加强,使得早播棉中后期的碳水化合物含量增加,为产量形成提供一定的物质基础。各处理的可溶性糖含量在2010年差异均不明显;在2011年第1播期中,R1的主茎功能叶可溶性糖含量自7月18日至8月20日开花结铃盛期极显著高于对照。在2010年第1播期中,R1, R2和R3的淀粉含量在8月20日显著高于对照,但在第2播期中R1,R2和R3的淀粉含量在吐絮初期阶段显著低于对照;在2011第1播期中R1和R2处理的淀粉含量分别在8月20日和7月18日显著高于对照。8.在2011年,各去早果枝处理的SOD活性与对照相比均无明显差异;在2010年,各处理的POD活性和MDA的含量也均无明显差异;但在2011年第1播期中,R1和R3的POD活性在9月20日极显著高于对照,R1的MDA含量在9月20日显著小于对照,在第2播期中R3的MDA含量在8月20日显著小于对照,但R1和R2在9月20日却明显高于对照,其余各时期处理间差异不明显。9.去掉早期果枝使得棉花的成铃重心向上向外发生移动。去掉早期果枝后,R2和R3的伏前桃比例显著减少,秋桃的比例显著增加,而各处理的伏桃比例无明显变化,说明去掉早期果枝后是通过秋桃比例的增加来补偿因果枝去除造成的棉铃损失。R2和R3的下部成铃比例显著降低,上部成铃比例和外围成铃比例显著增高,但各处理的中部成铃所占比例无明显差异。10.去早果枝(1个或2个)有利于提高棉花子棉产量,但对纤维品质无明显影响。第1播期中R1和R2的子棉产量均显著高于对照,各处理间皮棉产量差异不明显,2011年第1播期中R1的单位面积有效铃数显著高于对照,2年试验各处理的单铃重和衣分均无明显差异。去掉早期果枝虽然对棉花个别品质指标有改善作用,但多数未达显著水平。更多还原

【Abstract】 Using transgenic Bt cotton Guoxinmian 6 (2010) and Nongdamian 8(2011) as material, a field experiment was conducted in Baoding, with two sowing date treatment, in each sowing date ,plants were treated normally(CK),or by removing one basal fruiting branches ,removing two basal fruiting branches (R2) and removing three basal fruiting branches(R3), the effect of early fruiting branches removal(EFBR) on growth and development and physiological characteristics were studied through a two years experiment. With the objective of finding a way to delay he premature senescence process and to provide a theoretical basis for high yield and quality in cotton production . The results indicated as follow:1.The removal of EFBR delayed the growth and development process. The more fruiting branches removal, the more delay time is longer. Under the treatments of R1, R2 and R3, the whole growth stage was delayed by 3 days, 6 days and 9 days respectively. Proper amount of EFBR could make cotton blooming and flowering at the best growth period.2.The research indicates vegetive growth was enhanced after early fruiting branches removal , plant height and stem diameter increased in the first sowing under the treatment of EFBR. With the treatments of EFBR, the leaf area index (LAI) was significantly higher than control in the later growth period in the first sowing of two year experiment, but there was no obvious difference in the second sowing .3.The research indicates, after EFBR in the first sowing , there was no decrease or a increase on total fruiting branches number and fruit nods, and the ratio of fruiting branches number and fruit nod number was promoted , it could shape a ideal cotton plant type. There was no significant difference in the number of fruiting branches between R1 and CK, but R3 was significantly lower than CK. There was no significant difference in fruit nod number between treatments. The ratio of fruiting branches number and fruit nod of R1, R2 and R3 were significantly higher than CK in the first sowing of 2010.After the removal, because of vegetive growth was enhanced, the boll number per plant was promoted, the abscission rate and rotten boll rate were lowered. Under the treatment of early fruiting branches removal ,the boll number per plant was promoted in the first sowing ,but there was no significant difference in the second sowing .With the treatment of early fruiting branches removal, the abscission rate and rotten boll rate were both significantly lower than control.4.The result indicates vegetative growth was promoted in the late growth period after early fruiting branches removal, dry matter accumulation was increased, and it could delay the premature senescence process to some degree. Under the treatment of early fruiting branches removal, the dry matter accumulation and the dry matter accumulation rate of vegetative organs were significantly increased in the first sowing , but there was no obvious difference between treatments in the second sowing, and there was also no significant difference in reproductive organ dry matter accumulation and the dry matter distribution rate of reproductive organ between treatments.5.The result indicates the chlorophyll content was promoted and photosynthetic characteristic was improved at the later growth stage after one early fruiting branches removal. Two years experiment both indicated that Chlorophyll content in main stem functional leaves was promoted after EFBR at the later growth stage in the case of early sowing, especially the plants with one early fruiting branches removal were significantly higher than control, there were no significant differences in the second sowing. In the first sowing of 2010, the Chl a/b of R1 was significantly higher than control on August 20th and September 5th , but there were no significant differences in the year of 2011.6.The research indicates the nitrogen metabolism was improved after one or two early fruiting branches removal, it promoted the the soluble protein content and could delay the premature senescence process to some degree. The soluble protein content in main stem functional leaves of each treatment achieved its maximum on July 3th, but each treatment achieved its maximum on July 18th in the year of 2011. In the first sowing of 2010, the protein content of R1 was significantly higher than CK at the later growth period (Aug 29th and Sep 5th), in the second sowing, the differences between treatments were not obvious. In the first sowing of 2011, the maximum protein content in main stem leaves under the treatment of R1and R2 were both significantly higher than CK , there were no significant differences between other treatments.7. After EFBR, the ability of assimilation and synthesis was promoted , the carbohydrates content was increased in the late growth period, it provided a basis for high yield production. There was no significant difference in soluble sugar content between removal and control in 2010. In the first sowing of 2011, soluble sugar content in main stem leaves of R1 was significantly higher than control. Under the treatment of EFRB, the starch content was higher than control in the first sowing of 2010, but it was significantly lower than control in the initial boll opening stage in the second sowing, there was no significant difference in starch content in main stem leaves between removal and control in 2011. 8.This research indicates that there was no obvious difference in the activity of superoxide dismutase (SOD) between removal and control. In the first sowing of 2011, the peroxidase (POD) activity in main stem functional leaves under the treatments of R1 and R3 was significantly higher than control at the later growth stage , malondialde(MDA) in leaves under the treatment of R1 was significantly lower than control on Sep 20th , but it was higher than control in the second sowing.9. After the early fruiting branches removal, the pre-summer boll ratio of R2 and R3 were significantly decreased and the autumn boll ratio were significantly increased, but there was no obvious variation in the summer boll ratio. The result indicates, it could compensate the pre-summer boll loss by increase the autumn boll ratio after early fruiting branches removal. On the spatial distribution of the bolls, the lower boll ratio was decreased and the upper boll ratio was increased, the internal surround boll ratio decreased and the external boll ratio increased .It indicates early fruiting branches removal promoted the bolling center shift from lower part to higher part.10.The results indicated that early fruiting branches removal could promote the seed cotton yield , but it had no obvious effect on fiber quality. With the treatment of R1 and R2, the seed cotton yield was significantly higher than CK in the first sowing, but there was no difference in lint yield . Under the treatment of R1, the valid boll number per unit area was significantly higher CK in the first sowing of 2011, but there was no obvious variation in boll weight and lint. Some fiber quality indexes were improved after the removal, but the difference between treatments was not significant.更多还原