It is worth noting that Russia's land is very fertile, as the founder of the Russian agrology Dokukin恰耶夫pointed out, the black soil zone is Russia's main source of wealth, Russia's black earth has lost 20%-50% of humus, However, it is still the world's most fertile soil.

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Seed cones terminal, solitary, dehiscent when mature in 1st year; cone scales 8 or 10, decussate, flat, only middle, larger 2 or 3 pairs fertile, each fertile scale bearing 1 or 2 seeds; free bract apex a very short mucro.

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More calcium precipitates were located in the epidermis, endothecium and tapetum of the sterile anther than in those of the fertile anther. Longitudinal inner cell wall of the sterile anther became thicker than that of the fertile anther at the dyad stage and uninucleate pollen stage.

到四分體與單細(xì)胞花粉時(shí)期，不育花藥的木質(zhì)部細(xì)胞的次生加厚壁上有較多的Ca2+沉淀欧美精品品综合一区二区，連接組織中的Ca2+沉淀也大大增加另类视频区第1页，所有不育花粉外壁較厚而發(fā)育都不正常。

The paper fristly compared the fertile soil with the incinerated sterile soil on the number of micro-algae , soil pH value , soil organic matter soil available phosphorus and soil nitrogen.And then, the author put fertile soil, which included micro-algae, proportionally into sterile samples and cultivated them respectively under illumination condition (micro-algae can live and reproduce)and dark condition(micro-algae will die in some time).The above indices were measured in 0, 30, 60 and 90days respectively, The analyse of the interrelation between the change of micro-algae"s number and the changes of soil pH value, soil organic matter, soil available phosphorus and soil nitrogen indicated:Soil micro-algae which were native to fertile soil conld adapt to the changed circumstance and light acted as a decisive role to the distribution of soil micro-algae.Under dark condition,the micro-algae"s number declined gradually and went to zero in the end,while under illumination condition ,on the 90th day, the micro-algaes number of per gramme was 6-7 times more than that of the beginning.

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Racemes linear, dense, spikelets imbricate, 1 to several pairs of homogamous spikelets at base of raceme below fertile pairs, fragile between fertile pairs; internodes and pedicels reduced to short oblique stumps obscured by hairs from backside of sessile spikelet callus.

線(xiàn)形，緊密的總狀花序免费无码A片国在线看视频，覆瓦狀国内精品一区二区三区香蕉，同性花的1到數(shù)個(gè)小穗在總狀花序基部在下面能育對(duì)，在能育對(duì)之間脆华人在线精品免费观看；缺乏的節(jié)間和花梗退化至從無(wú)柄的小穗結(jié)繭的屁股頭發(fā)遮蔽的斜的殘干精品久久久久久中文字幕人。

Fertile and sterile pools were set up by bulked segregant analysis based on the selection for the highly fertile and highly sterile plants of Shanyou 63 F_2 populaiton The AFLP analysis of the two pools indicated that 64 primer combinations amplified 3 477 stable and clear bands.

選擇汕優(yōu)63F_2的高可育株和高不育株分別建立 2個(gè)基因池，利用 AFLP標(biāo)記技術(shù)對(duì)2 池間的多態(tài)性進(jìn)行了研究看成年人视频。分析表明，64組引物在兩池間全部擴(kuò)增出了穩(wěn)定亚洲三级视频在线、清晰的帶紋热久久久久，共計(jì)3 477條帶。

Through morphological analysis between male sterile plant and male fertile plant in the alabastrum period as well as in flowering period, one morphological mark was found that the alabastrum of male sterile plant was in cone shape; the alabastrum of male fertile plant was cylindraceous. The male sterile alabastrum and male fertile alabastrum were significantly different. The petal of male sterile is filiform but not lingulate and tubular , the normal one was just the opposite.

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Spikelets all alike, somewhat laterally compressed, with 1 to several fertile florets; rachilla usually disarticulating below each floret, occasionally strictly 3 florets with lower 2 staminate or barren and of different appearance from upper fertile floret, then disarticulating above glumes and florets falling together; glumes persistent, often equal to spikelet or at least longer than first floret, commonly membranous with broad, shining, hyaline margins; floret callus bearded; lemmas hyaline to leathery, 3- to several-veined ( Coleanthus 1-veined), apex entire or denticulate, awned from back, rarely awnless; awn usually geniculate with twisted column; palea hyaline, subequaling or much shorter than lemma.

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Fertile stamens 3, in a few flowers only anterior 2 fertile, posterior 1 depauperate or absent, often anterior 2 also depauperate; filaments densely white lanate; staminodes 3; antherodes 3-sect. Capsule ovoid, 1.5--1.7 cm, acute at apex.

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The fertile ratio of isolates from Jiangsu was 22.77%on average. Among them only 23 crosses produced ascospores and the ratio was 7.1%. But the fertile ratio showed great variation annually, 26.61%in 1997, 8.26%in 1998 and 33.64%in 1999 respectively. In addition, the fertile ratio of tested isolates collected from different areas was also dissimiar., 26.15%and 25.42%from Tongzhou and Ganyu, and only 15.38%from Yixing.

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