The germination of mucilaginous seeds of t Plantago coronopus,Reboudia pinnata, and t Carrichtera annua on cyanobacterial soil crustfrom the Negev Desert
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- 作者：Zaady ; Eli ; Gutterman ; Yitzchak ; Boeken ; Bertrand
- 关键词：biological effects ; cyanobacterial desert soil crust ; desertannuals ; germination ; mechanical effects ; mucilaginous seeds
- 刊名：Plant and Soil
- 出版时间：1997
- 出版年：1997
- 期刊代码：102_0032079X
- 类别：bio
- 卷：190
- 期：2
- 页码：247-252
- 数据来源：sp
摘要
We studied the effect of intact, crushed or sterilecyanobacterial soil crust from the Negev Desert highlandsof Israel as substrates for the germination of seeds ofthree annual plant species from local populations thatproduce mucilaginous seeds t Plantago coronopus, Reboudia pinnataand t Carrichtera annua.Mucilaginous seeds of these specieswere wetted on local intact cyanobacterial soil crust whichinhibited their germination in comparison with theirgermination on filter paper. However, the percentage ofgermination of each species differed on sterile and crushedsoil crust after 72 h of wetting. Germination of t Plantagocoronopus seeds was inhibited mechanically andbiologically on intact soil crust, since it wassignificantly higher on both crushed and sterile soilcrust. Germination of t Reboudia pinnata seeds was slightlymechanically and biologically inhibited on intact soilcrust, but germination on live crushed crust was higherthan on sterile crushed crust.By contrast, germination of t Carrichtera annua seeds was notmechanically inhibited bylive soil crust but there was significant biologicalacceleration of germination on intact soil crust relativeto crushed soil crust. Each of the three species exhibiteddifferent requirements forgermination. Germination of t P. coronopus is promoted bydisturbances and removing the crust components (includingits biological and structural effects). t R. pinnata and t C.annua germination is less affected by crust disturbance butis generally inhibited after removing the live componentsof the cyanobacterial crust.
These species differences suggest different functions ofthe mucilage of the seed coat for the three species.