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轴节间片

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The morphological and anatomical characteristics of"Zha′ai 76"Comparing with the plants of normal M.baccata and ordinary hybrid,"Zha′ai76"and other plants with Dw major gene showed that:the length of springgrowth or main shoot is shorter by 59.6-66.2%;the ratio of length:diame-ter of new shoot smaller by 33.2-58.4%;the length of internee shorter by14.0-42.7%:the node number of spring growth lesser by 40.7%;the cauli-cle height under the cotyledons of hybrid seedlings shorter by 65.0%;the in-dex of leaf stalk(stipe length:stipe thiek ness)on the spring growth smaller by34.5-50.2%;the length of leaf stalk shorter by 25.2-45.7%;the boundarybelt between spring and autumn growth has knob-like nodes;the margin of leafappears wave-like;the sepals with spinous proeessuses are massive and small;the eonstriction at calyx is not obvious;the trace of abscisic sepals is big;the ca-lyx end of fruit is plan or convex;the shape of shoot tip(of"Zha′ai 76")iswider and shorter;and in 1.0mm part from the top of shoot tip,there are manyspecialized cells which are larger in volarae,but with lesser inner material andwith smaller or no nucleus.

"扎矮76"的形态解剖特征与普通山定子和杂交后代中普通型植株对比,"扎矮76"和其它携带Dw主基因植株的:春梢短59.6-66.2%,梢长与梢粗比值小33.2-58.4%,节间短14.0-42.7%,春梢节数少40.7%,杂种苗下胚轴短65.0%,春梢叶柄形指数小34.5-50.2%,叶柄短25.2-45.7%,春秋梢交界处有瘤状突起,叶缘波状,萼片肥厚有刺状突起,萼部缢痕不明显,脱萼后萼痕较大、萼洼平或高于果面;新梢生长点宽而短,在距顶端1.0gmm处有较多体积较大、内容物较少、细胞核小或无的待化细胞。

Panicle open, 10–30 cm; branches in distant whorls, capillary, flexuous, 5–15 cm, mostly unbranched, tipped by a raceme; racemes 2–5-noded with 7–13 spikelets, sometimes branched with up to 40 spikelets, disarticulating at maturity, one spikelet of a pair sessile, the other pedicellate; rachis internodes and pedicels slenderly clavate, margins ciliate, hairs 0.7–1 mm. Spikelets 4.5–5 mm; callus hairs ca. 1 mm; lower glume lanceolate, thinly pilose, veins smooth below middle, scaberulous above, apex acuminate; upper glume ciliate on margins, acuminate or emarginate and mucronate; lower floret sterile, palea reduced; upper lemma 2-lobed to middle; awn 5.5–8 mm.

圆锥花序打开,10-30厘米;在远轮生方面的分枝,发状,,5-15厘米,多数不分枝,被总状花序端部; 7-13小穗2-5有节具的总状花序,40小穗的有时分枝具可达,成熟时脱节,一对无梗,另一个的一小穗;棍棒状的轴节间和花梗slenderly,边缘具缘毛,头发0.7-1毫米小穗4.5-5毫米;胼胝体毛约1毫米;披针形,稀疏具柔毛的下部的颖片,脉平滑的中间以下,在上面微糙,先端渐尖;在边缘上具缘毛的上面颖片,渐尖的或微缺和短尖;不育的下部小花,退化的内稃;上面外稃2裂的至中部;芒5.5-8毫米花粉囊2-3毫米。

Sessile spikelet longer than rachis internode; lower glume elliptic-ovate to oblong, papery to leathery, 5–9-veined, marginally 2-keeled, keels pectinately spiny, often winged at apex; upper glume 3-veined, keeled along midvein, otherwise almost flat, often narrowly winged on lower keel; lower floret staminate, palea present; upper floret bisexual, upper lemma entire, awnless.

无梗小穗长于轴节间;下部颖片椭圆状卵形到长圆形,纸质到革质,5-9脉,具刺的2龙骨状,龙骨状的pectinately,通常具翅的在先端的稍微; 3脉的上面颖片,龙骨状沿中脉,几乎平的否则,龙骨状的通常狭翅在下部;雄蕊花的下部的小花,内稃宿存;全缘的上面小花两性,上面外稃,。

Racemes (4–)10–40(–100),(8–)10–30 cm; rachis internodes glabrous, scaberulous or smooth, nodes glabrous; lower pedicel 0.5–1.5 mm, upper pedicel 1.5–4 mm. Spikelets 4–6.5 mm, pilose or glabrous, awned; callus hairs 5–8 mm, exceeding the spikelet; glumes subequal, membranous, 4–6.5 mm, 5-veined, back glabrous or pilose, puberulous at apex and along upper margins, apex acuminate; lower lemma lanceolate, hyaline, 3.5–4 mm, veinless, apex and margins puberulous, otherwise glabrous; upper lemma similar to lower, 2.5–3.5 mm; awn geniculate, 4–12 mm; upper palea a 1–2 mm scale.

总状花序(4-)10-40(-100),(8-)10-30厘米;轴节间的无毛,微糙的或平滑,节点无毛;更低的花梗0.5-1.5毫米,上面花梗1.5-4毫米小穗4-6.5毫米,具柔毛或无毛,具芒;胼胝体毛5-8毫米,超过小穗;颖片近等长,膜质,毫米,5-脉,背无毛或具柔毛,被微柔毛在先端和沿着上面边缘,先端渐尖;披针形,透明的下部外稃,3.5-4毫米,无脉,被微柔毛的先端和边缘,或无毛;类似于上面外稃降低,2.5-3.5毫米;膝曲的芒,4-12毫米;上面内稃一1-2毫米鳞片。

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