以母本中国南瓜(Cucurbita moschata Duch.)MO和父本印度南瓜(Cucurbita maxima Duch.)MA为对照,通过测定热胁迫前后植株叶片的相对电导率(E)、计算伤害率(RI)以及正向超亲优势PHA值和负向超亲优势NHA值,对36个中(MO)×印(MA)南瓜...以母本中国南瓜(Cucurbita moschata Duch.)MO和父本印度南瓜(Cucurbita maxima Duch.)MA为对照,通过测定热胁迫前后植株叶片的相对电导率(E)、计算伤害率(RI)以及正向超亲优势PHA值和负向超亲优势NHA值,对36个中(MO)×印(MA)南瓜远缘杂交新种质的F5和F6自交系进行耐热性评价。结果显示,RI对材料耐热性差异区分度高,与植株耐热表型结果吻合,与植物耐热性负相关,可直观评价中印南瓜远缘杂种后代耐热性。供试南瓜材料在热处理之后,相对电导率(E)均升高,表明热处理破坏了叶片细胞膜;不同材料之间相对电导率增加幅度不同,表明材料间细胞膜热稳定性存在差异。中国南瓜MO比印度南瓜MA耐热性强,其RI值分别为0.24±0.10和0.65±0.29。以MO和MA的RI值为阈值,共筛选到16个耐热株系(PHA值为-8.3%^-87.5%,平均值为-54.1%,PHA绝对值越大,正向超亲优势越明显),14个不耐热株系(NHA值为3%~40%,平均值为24.3%),及6个耐热性介于亲本之间的株系。供试材料整体上的耐热性呈两级分化,耐热性增强效果明显。F4的耐热性存在分离,18SH和18SE的后代耐热性增强,18SF耐热性减弱。以RI值0.15为阈值,筛选到13个表现出超亲优势的耐热株系,包括源于18SH的10个F5株系,2个源于18SE的F5株系和1个源于18FB的F6株系。筛选的耐热优系,为培育适宜越夏栽培的耐热印度南瓜新品种提供有价值的亲本。展开更多
Based on distance matrixW,the novel topological indexW F is defined by the matricesX,W,L,asW F=WXL.WhereX is a row matrix,which expresses the bonding characteristics between adjacent atoms;L is a column matrix express...Based on distance matrixW,the novel topological indexW F is defined by the matricesX,W,L,asW F=WXL.WhereX is a row matrix,which expresses the bonding characteristics between adjacent atoms;L is a column matrix expressing the characteristic of vertexes in molecules;W is a distance matrix,which expresses the chemical environment of the atoms in the molecule.the properties,the chemical environments and the interaction of the vertexes in a molecule are taken into account in this definition.Hence the application of the indexW F to multiple bonds and heteroatomcontaining organic systems or inorganic systems is possible.Good correlation coefficients are achieved not only in the prediction of the standard formation enthalpy of methyl halides,titanium halides,but also the retention index of gas chromatography of the hydrocarbons.展开更多
文摘以母本中国南瓜(Cucurbita moschata Duch.)MO和父本印度南瓜(Cucurbita maxima Duch.)MA为对照,通过测定热胁迫前后植株叶片的相对电导率(E)、计算伤害率(RI)以及正向超亲优势PHA值和负向超亲优势NHA值,对36个中(MO)×印(MA)南瓜远缘杂交新种质的F5和F6自交系进行耐热性评价。结果显示,RI对材料耐热性差异区分度高,与植株耐热表型结果吻合,与植物耐热性负相关,可直观评价中印南瓜远缘杂种后代耐热性。供试南瓜材料在热处理之后,相对电导率(E)均升高,表明热处理破坏了叶片细胞膜;不同材料之间相对电导率增加幅度不同,表明材料间细胞膜热稳定性存在差异。中国南瓜MO比印度南瓜MA耐热性强,其RI值分别为0.24±0.10和0.65±0.29。以MO和MA的RI值为阈值,共筛选到16个耐热株系(PHA值为-8.3%^-87.5%,平均值为-54.1%,PHA绝对值越大,正向超亲优势越明显),14个不耐热株系(NHA值为3%~40%,平均值为24.3%),及6个耐热性介于亲本之间的株系。供试材料整体上的耐热性呈两级分化,耐热性增强效果明显。F4的耐热性存在分离,18SH和18SE的后代耐热性增强,18SF耐热性减弱。以RI值0.15为阈值,筛选到13个表现出超亲优势的耐热株系,包括源于18SH的10个F5株系,2个源于18SE的F5株系和1个源于18FB的F6株系。筛选的耐热优系,为培育适宜越夏栽培的耐热印度南瓜新品种提供有价值的亲本。
基金Supported by the National Natural Science Foun-dation of China(20177018)the Educational Bureau Foundation of Hubei(2003BOO1)
文摘Based on distance matrixW,the novel topological indexW F is defined by the matricesX,W,L,asW F=WXL.WhereX is a row matrix,which expresses the bonding characteristics between adjacent atoms;L is a column matrix expressing the characteristic of vertexes in molecules;W is a distance matrix,which expresses the chemical environment of the atoms in the molecule.the properties,the chemical environments and the interaction of the vertexes in a molecule are taken into account in this definition.Hence the application of the indexW F to multiple bonds and heteroatomcontaining organic systems or inorganic systems is possible.Good correlation coefficients are achieved not only in the prediction of the standard formation enthalpy of methyl halides,titanium halides,but also the retention index of gas chromatography of the hydrocarbons.
