Abstract
Massive seed consumption is typical in many deserts. The “escape” or “protection” strategies of seed dispersal are important, as they prevent massive seed consumption.
The more extreme the desert, the more unpredictable the low amounts and distribution of the rains as well as the beginning and length of the season or seasons with rains. Seeds, which have the highest resistance to extreme environmental conditions, develop during germination into seedlings, which are the most sensitive. Therefore, germination of parts of the seed population at their respective proper times spreads the risk over time and is thus very important for plant survival, especially in those plants inhabiting the more extreme deserts.
Each of the plant species studied was found to have its own survival strategies of seed dispersal and germination. At least two extreme seed-dispersal and germination strategies have been observed: 1) the “escape” seed dispersal and “opportunistic” portioned seed-germination strategies, such as inSchismus arabicas andSpergularia diandra, and 2) the “cautious” portioned dispersal by rain of the protected seeds, such as inAsteriscus hierochunticus and portioned dispersal and rapid germination strategies such as inBlepharis spp.
The fate of future generations, as far as the germinability of seeds of some species is concerned, depends on the influences of maternal and environmental factors when the seeds are still on the mother plant, mostly during the final stage of seed maturation, as inTrigonella arabica. It may even depend on the position of the caryopsis from which the mother plant originated, as inAegilops geniculata.
The dry post-maturation conditions and the environmental factors during seed wetting and germination may also affect the percentage of seed germination, as inSchismus arabicus.
Гуггерман
Для экстремального т ипа пустынь характер на непредсказуемость к оличества и распреде ления осадков, а также начала и продол жительности сезона д ождей. Кроме того, типичным явлением дл я многих пустынь явля ется массовое поедание семян живот ными и насекомыми.
Устойчивые к экстрем альным условиям семе на развиваются при прорастании в про ростки, обладающие чр езвычайной чувствительностью. П оэтому для выживания растения в экстремальной пусты не особенно важны вер ные сроки прорастания, а также п рорастание только ча сти семенной популяции. Эти механи змы помогают растени ям снизить риск гибели проростков. Дл я защиты от массового поедания после созревания важны стр атегии “бегства” и “з ащиты” в распространении сем ян.
Характерная стратег ия распространения и прорастания семян обнаружена для каждо го изученного вида ра стений. Отмечены два крайних типа стра тегий:
1) “бегство” в распрост ранении семян и “оппортунистическа я” стратегия частичног о прорастания семенн ой популяции. Примерами могут служ ить Schismus arabicus и Spergularia diandra, 2) “осторожое” частич ное распространение защищенных семян сем ян при увлажнении, как у Asteriscus pygmaeus, или частичное распр остранение семян в со четании со стратегией быстрого прорастания у видов Blepharis.
Свойства семян завис ят от условий во время их развития на материнском растени и, особенно на заверша ющей стадии их созревания, как у Trigonella arabica. У Aegilops geniculata механизм прорастани я семян связан даже с расположением зерновки на материнс ком растении. Свойств а семян и стратегия их прорастания влияю т на развитие растени й последующих поколений
Хранение семян после созревания в жарких и сухих условиях, а также усло вия окружающей среды во время увлажнения и прораст ания семян, могут влия ть на процент прорастания семян Schismus arabicus.
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Gutterman, Y. Strategies of seed dispersal and germination in plants inhabiting deserts. Bot. Rev 60, 373–425 (1994). https://doi.org/10.1007/BF02857924
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DOI: https://doi.org/10.1007/BF02857924