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通过不同试验材料、GA3应用和变温层积催芽对比试验,对刺楸种子解除休眠进行研究的结果表明:鲜种+GA3+(15℃,30 d;冷冻,90 d;-4~0℃,90 d)处理方法发芽率达到90.2%,出苗率达到81.5%;气干种温水(72 h)+GA3+(13~18℃,90 d;0~4℃,90 d)处理方法发芽率达到76.3%,出苗率达到66.4%。采用鲜种进行变温催芽处理对刺楸种子发芽率、出苗率和1年生苗木质量提高具有显著作用(p<0.01和p<0.05)。研究表明,刺楸种子属于形态-生理休眠类型,采用鲜种+GA3+变温层积催芽的综合处理方法能有效解除刺楸种子休眠。 相似文献
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测定分析了10种国外产竹种子的形态特征,并对他们进行育苗试验。结果表明:种子形状多为卵形、长锥形、椭球形,颜色以黄褐色、褐色、褐黑色为主,长度和直径分别为4~60 mm和0.9~5.5 mm;果实一般为圆锥形、锥形、卵形,颜色以灰褐色、灰色为主,长度和直径分别为5~64 mm和1.2~7.5 mm;大藤竹种子播种品质指标最好,具有最高的纯净度(97.4%)、千粒质量(201.0 g)、发芽率(95.4%)、发芽势(51.5%)、含水量(9.3%)、生活力(98.8%)及较低的病虫害感染度(6.5%);有机质是有效提高各竹种出苗率的首选基质;宜采用先撒播种子,待胚苗有1~3片叶时再移入营养袋培育的育苗方式;育苗时施用氮磷钾复合肥,并在苗木离地50 cm处进行封顶处理,能有效促进苗木生长。 相似文献
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以黄檗种子和1 a生播种苗为材料,研究不同沙藏层积时间对发芽率与出苗率和不同播种密度对苗高与地径生长的影响,结果表明:当沙藏层积时间达到150 d时,种子发芽率和出苗率均最高,分别为80.85%和64.09%;当播种密度为90株·m~(-2)时,单位面积Ⅰ级苗产量最高,达到96.15%。 相似文献
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为了研究青钱柳种子破除休眠,提前播种出苗的方法。采用赤霉素不同浓度溶液对青钱柳种子进行"浸泡后直接播种"、"浸泡并沙藏后播种"2组种子处理育苗试验。结果表明:浸泡后直接播种没有打破种子休眠,播种当年出苗率为0,第2年才出苗;浸泡并沙藏后播种能打破种子休眠,播种第1、2年均出苗,总出苗率13.54%~28.13%,第1年出苗率2.08%~5.21%,占总出苗率的9.1%~27.8%。其中,赤霉素500、750 mg/L浓度溶液浸泡及沙藏处理后,破除种子休眠效果明显,当年出苗率为5.21%,依次占总出苗率的23.8%、27.8%,是适宜的种子处理溶液浓度。 相似文献
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分别采用0,20,40,60,80,100 Gy 剂量的60Co-γ射线辐射洋紫荆(Bauhinia variegata)种子,观察测定其种子发芽率和幼苗生长指标,研究辐照对洋紫荆种子的诱变效应。结果表明,在0~100 Gy 辐射剂量内,随着辐照剂量的增加,洋紫荆种子发芽率出现先下降再上升的趋势,由51.66%(20 Gy)降至42.66%(60 Gy),又升高至54.33%(100 Gy)。一定剂量的辐照能促进胚根的生长,其中20 Gy 的辐射下平均胚根长度为3.28 cm,显著大于对照组(2.49 cm)(P<0.05)。40~60 Gy 辐射剂量使种子发芽率和幼苗成活率降低。各辐照处理对幼苗苗高、地径生长具有明显抑制作用,幼苗生长6个月后,各辐照组苗高、地径均显著小于对照组(P<0.05),同时对叶片分裂角度也具有一定的抑制作用但幼苗未出现致畸形态。 相似文献
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Improvement in seed and seedling quality of Acacia auriculiformis after culling phenotypically inferior trees was studied
in a 6-year old seed production area (SPA). A 5-ha plantation was identified, of which 2.3 ha was converted into SPA. The
initial stocking, 1 612 trees·ha−1, was thinned down to 982 trees·ha−1 based on growth characteristics. The following fruiting season, seeds were collected from 10 randomly selected trees in culled
and non-culled stands, and seed physical characters, germination and seedling traits were assessed. Seed weight, seed thickness
and percentage germination increased by 32.1%, 4.43% and 22.37%, respectively in the culled stand compared to the non-culled
stand. Culling also increased the speed of germination, seedling dry weight and seedling vigor index. Heritability values
were high for seed weight (0.974) and seed thickness (0.948) while medium values were observed for percentage germination
(0.577) and total dry weight (0.534). Predicted genetic gain was 11.13% and 11.22% for seed weight and percentage germination,
respectively. The actual gain was 32.1, 51.9 and 22.9% for seed weight, percentage germination and total dry matter, respectively.
In conclusion, SPAs established by culling inferior trees could serve as sources of good quality seeds for reforestation programs
until genetically improved seeds are made available. 相似文献