摘要
为了探索解决夏薯苗期干旱的农艺措施,研究PEG-6000模拟干旱条件下,烯效唑、缩节胺和生根粉浸根处理对根系形态、生理生化指标和内源激素质量分数的影响。结果表明:烯效唑和缩节胺浸根处理显著降低甘薯各品种根系的根长和根表面积,而生根粉显著增加根系根长、降低根表面积;烯效唑显著提高各甘薯品种的根系平均直径和根系体积;缩节胺提高5个甘薯品种根系的POD活性,降低各甘薯品种根系的MDA质量摩尔浓度,而烯效唑和生根粉不同程度降低各甘薯品种根系的POD活性和MDA质量摩尔浓度;与烯效唑和缩节胺不同,生根粉提高全部供试甘薯品种根系中的SOD活性;3种调节剂处理均提高部分品种的根系活力,但仅提高部分品种根系中的ZR质量分数,显著降低各甘薯品种的GAs质量分数;烯效唑提高所有供试品种根系中的ABA质量分数,烯效唑和缩节胺显著提高部分供试品种根系中的IAA质量分数;而生根粉不同程度降低全部供试品种根系IAA质量分数。总之,3种调节剂对干旱条件下甘薯苗期根系的形态性状、生理生化指标和内源激素水平都有显著的影响,但是存在调节剂种类和甘薯品种之间的特异性。
For exploring agronomic measures to solve the problem of drought at seedling stage of sweetpotato, effects of uniconazole, mepiquat chloride and rooting powder on sweetpotato roots mor- phology, endogenous hormone mass fraction, physiological and biochemical indexes under simulated drought stress were studied. The results showed that uniconazole treatment and mepiquat chloride treatment all significantly decreased root length and root surface area of all sweetpotato roots, while rooting powder treatment significantly increased the roots length and decreased roots surface area. The uniconazole treatment significantly increased average root diameter and root volume of all sweetpotato roots in research. The mepiquat chloride treatment increased POD activities of root in 5 sweet potato varieties, but decreased their MDA molality, but uniconazole treatment and rooting powder treatment decreased POD activities and MDA molality of all sweetpotatoes with different levels. It was different to uniconazole and mepiquat chloride, rooting powder treatment increased the SOD activ- ities of all sweetpotato roots in research. All these three kinds of regulator treatment increased root activities of all sweetpotato roots, but only increased the zeatin riboside mass fraction of several kind of sweetpotato, and significantly decreased the gibberetlin acid mass fraction of all sweetpotato root. The uniconazole treatment increased the mass fraction of abscisic acid of all sweetpotato roots, unicon azole treatment and mepiquat chloride treatment significantly increased the mass fraction of indole-3 acetic acid of several sweetpotato, while rooting powder treatment decreased the mass fraction of in- dole-3-acetic acid of all sweetpotato roots. To sum up, all these three kinds of plant regulator treat ment significantly affected the root morphology, endogenous hormone mass fraction and physiological and biochemical indexes under drought stress, but these effects are different between different kind of plant regulator and sweet potato varieties.
出处
《西北农业学报》
CAS
CSCD
北大核心
2014年第10期97-104,共8页
Acta Agriculturae Boreali-occidentalis Sinica
基金
国家甘薯产业技术体系(CARS-11-B-11)
关键词
甘薯
干旱
植物生长调节剂
根系
Sweetpotato
Drought stress
Plant growth regulator
Roots
