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首页> 外文期刊>Seed Science and Technology >Caryopsis extraction from big bluestem spikelets (Andropogon gerardii) with seed conditioning equipment: optimal water activity for recovery and seed quality.
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Caryopsis extraction from big bluestem spikelets (Andropogon gerardii) with seed conditioning equipment: optimal water activity for recovery and seed quality.

机译：利用种子调理设备从大蓝小穗（Andropogon gerardii）中提取颖果，可以达到最佳水分活度，从而提高种子质量。

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摘要

Big bluestem is a perennial, warm-season grass that produces spikelets with appendages and awns. This chaffy grass species does not readily flow through commonly available field sowing equipment. In addition, spikelets may not be filled resulting in decreased pure live seed (PLS). Intact caryopses can be extracted from spikelets with seed conditioning equipment; however, mechanical damage may occur. The objective of this study was to determine the optimum water activity (aw) needed to minimise mechanical damage during conditioning and thus achieve high seed quality. Water activity (aw) of big bluestem spikelets was adjusted to 0.55, 0.65, 0.75 or 0.85. The spikelets were then brushed with a brushing machine (Westrup LA-H) for 1, 2 or 3 minutes. Greatest germination was obtained with caryopses extracted from spikelets adjusted to 0.75 aw and brushed for one minute. Brushing spikelets with lower water activity or for longer durations resulted in greater mechanical damage to the caryopses. Recovery of caryopses from spikelets was less than 50% in all treatments. Caryopses and spikelets showed similar ageing trends thus brushing did not reduce longevity. Methods are presented to increase seed water activity to a desired level prior to brushing.
机译：大蓝茎是多年生的暖季草，产生带有附属物和芒的小穗。这种低矮的草种不易流过常用的田间播种设备。此外，小穗可能未充满，导致纯活种子（PLS）减少。可以使用种子调理设备从小穗中提取完整的颈章鱼;但是，可能会发生机械损坏。这项研究的目的是确定最佳的水分活度（aw），以最大程度地减少调节过程中的机械损伤，从而获得高品质的种子。蓝茎小穗的水分活度（aw）调整为0.55、0.65、0.75或0.85。然后用刷毛机（Westrup LA-H）将小穗刷毛1、2或3分钟。用从小穗中提取的章鱼提取物调节到0.75 aw并刷洗一分钟，可获得最大的发芽率。刷刷水分活度较低或持续时间较长的小穗会导致对章鱼的机械损伤更大。在所有处理中，小穗中颈章病的恢复率均低于50％。扇贝和小穗显示出相似的衰老趋势，因此刷牙不会降低寿命。提出了在刷洗之前将种子水分活度提高到所需水平的方法。

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