长选一号系长春市农科院水稻所1980年以吉粳0为母本、雄基9号为父本，经有性杂交，系谱法选育而成。1991年宁夏农作物品种审定委员会审定通过，1992年在北方 稻区域试验总结大会通过，1994年1月通过吉林省农作物品种审定委员会审定，定名“长选一号”。

对松嫩草地兴安胡枝子与细叶胡枝子地上生物量动态及种间进行的比较研究结果表明，在整个生长季内，2种胡枝子地上总生物量与茎、叶生物量的动态变化与季节气候变化相适应，呈幂函数增长的“S”型曲线形式；花果生物量则呈逐渐增加的直线形式。兴安胡枝子地上总生物量与茎、叶、花果生物量明显高于细叶胡枝子，其最大值分别是细叶胡枝子的1.78，1.31，1.59和3.62倍。在整个生长季，2种胡枝子叶的比重逐渐下降，茎比重逐渐上升，叶比重的急速下降与其生殖生长的开始相关。2种胡枝子RGR双峰曲线的动态变化是与在整个生长发育阶段的外界环境因子的变化紧密相关的。由兴安胡枝子的分枝数量明显大于细叶胡枝子得出，在建立人工草地时，兴安胡枝子应比细叶胡枝子合理稀植。

观测了五脉山黧豆的开花动态，并用杂交指数(OCI)、花粉-胚珠比（P/O）方法测定了其有性繁育系统类型。结果表明，五脉山黧豆的花期持续45d左右，盛花期为6月下旬左右。开花的日动态呈明显的双峰现象，2峰分别在8:00-11:00和14:00-15:00时出现。五脉山黧豆的杂交指数(OCI)=3，繁育系统为自交亲和，有时需要传粉者；花粉-胚珠比（P/O）=2286.21，为兼性异交。得出其繁育类型为混交繁育系统，即自交和异交并存。五脉山黧豆的传粉系统不完善和虫害是结实率低的主要原因。

为揭示五脉山黧豆根茎无性繁育规律，进行了人工切段不同长度根茎移栽与成苗率和生物量关系的研究。结果表明，盆栽条件下，移栽根茎长度由1cm增加到5cm，成苗率不但由8.0%增加到84.0%,而且显著地提高了成苗势，生根粉有进一步明显增加成苗率和成苗势作用；春天田间干旱条件下，移栽根茎长度在5～20cm时，虽然成苗率主要受覆土深度的影响，而与根茎长短无关，但移栽根茎长度与地上地下各组分生物量间存在着显著的直线正相关关系；由不同生境条件下极其明显的地上地下生物量和形态变化，表明了对适宜环境生长的可塑性响应。

对不同生境羊草营养枝叶龄进程及其与地上生物量的关系进行了研究，结果表明，人工草地和天然草地羊草营养枝叶龄进程季节动态是基本一致的，但因不同生境出叶速度的差异，使人工草地羊草营养枝的叶龄为11.3，比天然草地增加了16，5%。不同生境羊草营养枝的叶龄与叶片长度、宽度和叶片大小的关系均符合二次多项式的变化规律，人工草地和天然草地叶片最大时的叶龄指数分别为61.95和61.86，具有相对稳定的值；虽然叶龄与株高和单株干物重间均呈一元线性极显著的正相关关系，但每龄叶增加的植株高度和单株干物重因生境不同而异。

利用人工模拟光源研究了分蘖拔节期外施不同浓度的赤霉素(GA3)对羊草光合速率(Pn)、蒸腾速率(Tr)、水分利用率(WUE)、气孔导度(Gs)及叶面饱和蒸气压亏缺(VpdL)随模拟光辐射(SPR)增强的变化规律。结果表明，羊草经赤霉素处理后单位叶面积的Pn下降，且随着处理浓度的增加而减小。各处理的Gs随赤霉素浓度的升高而变大，均低于对照，VpdL随浓度的升高逐渐变大。25和50mg/L两个处理的Tr值低于对照，其它浓度的处理Tr高于对照。25和50mg/L的赤霉素处理可以提高WUE，25mg/L处理的效果最明显，当浓度超过50mg/L后随着浓度的增加羊草WUE逐渐下降。

本文主要研究了高赖氨酸玉米株高、叶角和叶面积三个株形性状及穗粒重、千粒重和籽粒产量三个产量性状。这些性状在F1代均表现出明显的杂种优势。其中株高的杂种优势最大，但在试验范围内株高与产量之间没有显著的相关性，在今后的育种中可适当地降低株高。叶角和叶面积在F1代为正优势，要获得紧凑型高赖氨酸玉米杂交种就必须选择叶角更小的亲本自交系。本试验中的紧凑型高赖氨酸玉米没有表现出明显的超高产优势，说明高赖氨酸玉米的产量形成是较复杂的，既受株形因素的影响,也受其它性状的影响。优质前提下超高产必须要实现株形性状与其它优良农艺性状的结合。

Recently, rice varieties having large panicles with many spikelets are expected to produce high yield. However, the ripening, growth pattern, priority to photoassimilate partitioning and final grain weight in each spikelet vary with the position of the spikelet in a panicle. There fore, not only the panicle size but also rachis-branching system in a panicle is an important factor determining the yield. In this report, we performed principal component analysis to characterize the rachis-branching system in 65 japonica varieties. In the principal component analysis, the proportions of variability explained were 49. 6 and 22. 2% for the first two attribute components. The first principal component was assumed as the factor of size in number, and the second principal component was assumed as the factor of panicle. The distribution of the scores for each variety in the scatter diagram showed a large diversity in panicle characteristics in japonica varieties. A small number of varieties had scores distributed in the first quadrant of the scatter diagram. These varieties would be high-yielding because the number of spikelets is high in the panicle having a relatively large number of primary rachis-branches compared with the secondary rachis-branches. Some chusters in the scatter diagram were related with their origins.

The sink capacity (floret number per unit land area) is currently a serious constraint to grain yield production in japonica rice. The size and activity of the early reproductive shoot apex (incipient panicle) are potential determinants of the number of florets generated on the panicle. This hypothesis was tested using eight field-grown japonica rice cultivars (IR65598-112-2, IR65564-44-51, Nipponbare, Akenohoshi, Dobashi 1, Koshihikari, Kochihibiki and Nakateshinsenbon). Using morphometric microscopy, we found that the initial size of the reproductive shoot apex was highly correlated with the number of primary branches, but not with the number of florets per primary branch. The cell division activity of the early reproductive apex examined by in situ hybridization analyses using the histone H4 gene probe as a marker for DNA-replicating cells varied with the cultivar. Akenohoshi had twice as many DNA-replicating cells as Nipponbare and the cell division activity was highly correlated with the number of florets per primary branch, but not with the primary branch number. We concluded that the primary branch number was determined by the initial size of the reproductive apex, and that the floret number per primary branch was determined by the cell division activity in the following apex growth. This result provides the first evidence of a relationship between cell division activity and floret formation in the rice panicle.