冰草属植物叶片解剖特征及其分类价值

运用解剖学的手段对冰草属５种植物的叶片表皮结构和横切面结构进行了观察，发现叶片远轴面的表皮结构对冰草属属下等级的分类具有一定的意义，其区别特征上要表现在长细胞的大小，细胞壁波纹状弯曲的程度、成对短细抱的数目、气孔带的数目、副卫细胞的形态、以及微毛和刺毛等表皮附属物的分布与形态特征上．     

小麦品种（系）叶绿素含量变化及其与光合叶面积关系研究

对3种类型11个小麦品种（系）的叶绿素含量变化及其与光合叶面积关系进行了研究。结果表明,中粒型品种（系）的叶绿素（a b）高峰出现早,且生育后期下降快;小粒型和大粒型品种（系）叶绿素（a b）高峰出现较迟。为同类型品种（系）叶绿素（a/b）值在整修生育期呈下降趋势,中粒型品种（系）的chl(a/b）均低于另外两种类型品种（系）。高产品种生育后期叶绿素含量高值期持续时间长,叶绿素（a/b0低。多元相关分析表明,在籽粒灌浆期,叶绿素（a b）值呈显著负相关;叶绿素（a b）值与旗叶面积呈显著负相关。小麦育种上应选择生育后期叶绿素（a b）较高,叶绿素(a/b）值低,且旗叶面积相对较大的品种。     

Loess buried paleosols geosols welded paleosols pedocomplexes towards a global quaternary pedostratigraphy and paleoclimatic history

Micromorphological studies show that a comparision of the loess-paleosol sequence of the Karamaydan section, Central Asia, with the upper part of the Luochuan section, China, clearly indicates that for the Brunhes chron the sequence at Karamaydan is even more detailed than the corresponding section at Luochuan. Single paleosols at Luochuan correspond to pedocomplexes at Karamaydan; some pedocomplexes at Luochuan are represented by more detailed successions at Karamaydan (fig. 1). The loess-paleosol sequence at Karamaydan should therefore be regarded as a key sequence for reconstructing the climatic history of the Brunhes epoch. Correlation with the deep-sea oxygen isotope record of Bassinot et al. (1994), which includes an accurate astronomical time scale, allows a detailed chronostratigraphical subdivision of the loess-paleosol sequence in Karamaydan for the Brunhes chron. Mineralogical and clay mineralogical investigations show that there is little difference in the type and amount of pedogenic clay mineral formation between two Holocene soils and the paleosols in the Brunhes chron at Karamaydan. These results indicate that the climates of the interglacials represented by the B or Bt horizons of the buried paleosols were similar to that of the Holocene. In view of these results the Paleopedology Commission should develop a uniform terminology of mono- and polygenetic paleosols and pedostratigraphic units which can be used globally.     

果树光合作用的数学模型

根据果树光合作用与环境因子之间的关系，建立了以光强、叶温和叶龄为输入变量的光合作用模型，从该模型可以导出果树叶片光合作用对环境因子的综合响应曲面。以实测龙眼光合作用数据模拟检验，表明模型的拟合效果良好。     

非离体快速测定荞麦叶面积方法研究

本文针对荞麦叶片的特殊形状，卵形、心形、戟形、披针状心形和箭形等，叙述了特殊系数法非离体快速测定荞麦叶面积的方法，其叶面积公式为：S=1．1ΔS和S=0．9ΔS。     

Fine mapping of an incomplete recessive gene for leaf rolling in rice （Oryza sativa L.）

Genetic analysis and fine mapping of genes controlling leaf rolling were conducted using two backcrossed generations （BC4F2, BC4F3） derived from a cross between QMX, a non-rolled leaf cultivar as a recurrent parent, and JZB, a rolled leaf NIL of ZB as a donor parent. Results indicated that leaf rolling was mainly controlled by an incompletely recessive major gene, namely rl（t）, and at the same time, affected by quantitative trait loci （QTLs） and/or the environment. A genetic linkage map was constructed using MAPMAKER/EXP3.0 with eight polymorphic markers on chromosome 2, which were screened by BAS method from 500 SSR markers and 15 newly developed insertion/deletion （InDel） markers. The position of rl（t） was estimated with composite interval mapping （CIM） method using WinQTLcart2.5. Gene rl（t） was mapped between markers InDel 112 and RM3763, and 1.0 cM away from InDel 112 using 241 plants in BC4F2 population. To fine map r（t）, one BC4F3 line with 855 plants was generated from one semi-rolled leaf plant in BC4F2. Four new polymorphic InDel markers were developed, including InDel 112.6 and InDel 113 located between markers InDe1112 and RM3763. Based on the information of recombination offered by 191 rolled leaf plants and 185 non-rolled leaf plants from the BC4F3 line ,we mapped r（t） to a 137-kb region between markers InDel 112.6 and InDel 113. Homologous gene analysis suggested that r（t）was probably related to the process of leaf development regulated by microRNA.     

水稻同工酶与叶鞘颜色连锁遗传的研究

通过水稻两个杂交组合三个性状的遗传特点和相互关系的研究，表明水稻酯酶同工酶１２Ａ，过氧化物酶１５Ａ和叶鞘颜色分别受三个基因位点（ＥＳｔ—３，Ｐｏｘ—４和Ｐｓｈ）控制。三个性状间存在明显的连锁关系。三点测交结果表明，控制上述三个性状的基因间的排列顺序是Ｐｓｈ～Ｅｓｔ—３～Ｐｏｘ—４。基因间的遗传距离为，Ｐｓｈ～Ｅｓｔ—３之间５．６，Ｅｓｔ—３～Ｐｏｘ—４之间１３．５．     

错位认知下的艺术母题及生命之思——《最后一片叶子》的另一种解读

存在着质的区别的最后一片叶子由于其实用价值的一致性和形体的相似性而取得了统一,由它们所形成的矛盾统一体在琼珊的错位认知的导引下,形成了一种结构上的开放性,欧.亨利这样的艺术处理至少引出两组悖论式的结局,这两组矛盾在更深层的意义上揭示了一个永恒的文学母题:艺术可以使一个人获得真正意义上的赎救。而在最后一片叶子所营造的极端化情景中也潜藏着对生命的深沉思考:珍视现世抑或追求艺术上的永生。     

通气状况与氮素形态对水稻和旱稻生长的影响

采用营养液培养法研究通气状况与氮素形态对水、旱稻生长和养分吸收的影响。结果表明，通气与不通气相比，通气明显的增加了植物地上部和地下部的生物量；同时验证了水稻喜NH4^ 和旱稻喜NO3^-的吸收特性。叶面积测定与地上部生物量的趋势完全一致，表明这种生物量的增加与光合作用增强、光合面积增大有关。植物地上部全N、P、K含量测定显示，通气状况与氮素形态对水、旱稻生物量的影响与N、P、K营养元素的吸收没有直接关系。