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The role of soil temperature and seed dormancy in the creation and maintenance of persistent seed banks of Nassella trichotoma (serrated tussock) on the Northern Tablelands of New South Wales
Rangeland Journal ( IF 1.2 ) Pub Date : 2020-07-03 , DOI: 10.1071/rj20008
Annemieke Ruttledge , Ralph D. B. Whalley , Gregory Falzon , David Backhouse , Brian M. Sindel

A large and persistent soil seed bank characterises many important grass weeds, including Nassella trichotoma (Nees) Hack. ex Arechav. (serrated tussock), a major weed in Australia and other countries. In the present study we examined the effects of constant and alternating temperatures in regulating primary and secondary dormancy and the creation and maintenance of its soil seed bank in northern NSW, Australia. One-month-old seeds were stored at 4, 25°C, 40/10°C and 40°C, in a laboratory, and germination tests were conducted every two weeks. Few seeds germinated following storage at 4°C, compared with seeds stored at 25°C, 40/10°C and 40°C. Nylon bags containing freshly harvested seeds were buried among N. trichotoma stands in early summer, and germination tests conducted following exhumation after each season over the next 12 months. Seeds buried over summer and summer plus autumn had higher germination than seeds buried over summer plus autumn plus winter, but germination increased again in the subsequent spring. Seeds stored for zero, three, six and 12 months at laboratory temperatures were placed on a thermogradient plate with 81 temperature combinations, followed by incubation at constant 25°C of un-germinated seeds. Constant high or low temperatures prolonged primary dormancy or induced secondary dormancy whereas alternating temperatures tended to break dormancy. Few temperature combinations resulted in more than 80% germination.



中文翻译:

在新南威尔士州北部平原上,土壤温度和种子休眠在建立和维持毛状纳瑟菌(锯齿状的草)持久性种子库中的作用

大型且持久的土壤种子库是许多重要草类杂草的特征,其中包括Nassella trichotoma(Nees)Hack。前阿雷恰夫。(锯齿状草丛),是澳大利亚和其他国家的主要杂草。在本研究中,我们研究了恒定温度和交替温度对调节初级和次级休眠以及在澳大利亚新南威尔士州北部土壤种子库的创建和维护的影响。将一个月大的种子在实验室中分别储存在4、25°C,40/10°C和40°C下,每两周进行一次发芽测试。与在25°C,40/10°C和40°C下储存的种子相比,在4°C下储存后很少发芽的种子。装有新鲜收获种子的尼龙袋被埋在毛滴虫中站在初夏,并在接下来的12个月中每个季节后进行尸体发掘后进行发芽测试。夏季和夏季加秋季埋藏的种子比夏季加秋季加冬季埋藏的种子发芽率高,但随后的春季发芽率再次增加。将在实验室温度下储存零,三,六和十二个月的种子放在具有81种温度组合的热梯度板上,然后在恒定的25°C下孵育未发芽的种子。恒定的高温或低温延长了初级休眠或诱发了次级休眠,而交替的温度往往会破坏休眠。很少的温度组合导致超过80%的发芽。

更新日期:2020-08-20
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