摘要： 采用聚乙二醇(PEG)6000溶液模拟水分胁迫条件(0,-0.2,-0.3,-0.4MPa)对8份番茄种子进行萌发试验,研究了番茄萌发期渗透胁迫对种子萌发状况的影响。结果显示:渗透溶液的浓度越高对种子萌发的胁迫程度越大,并且在-0.4MPa水势下,所有材料都不能发芽。在-0.2～-0.3MPa水势下相对发芽势、相对发芽率、相对发芽指数、相对活力指数、胚根生长都受到不同程度的抑制,且两种浓度下的萌发耐旱指数具有相关性(r=0.759^*)。通过萌发期耐旱指数与各指标的相关分析、聚类分析,认为选用-0.2～-0.3MPa的PEG6000溶液都可进行番茄萌发期耐旱性鉴定,并明确了萌发期耐旱性鉴定的指标体系,为综合评价不同番茄品种萌发期耐旱性奠定了基础。

关键词: 番茄, 萌发期, 耐旱性, 鉴定指标

Abstract: Using polyethylene glycol PEG6000 with osmotic potential from－0. 2 MPa to－0. 4 MPa as simulating water stress,experiment on germination of seeds of eight tomato varieties was done,effections of osmotica stress on tomato seed germination were researched. The result indicated that the higher the osmotic concentration was,the greater degree of coercion stress on seed germination was,all the materials could not germinate under－0. 4 MPa osmotic potential,the relative germinative energy,relative germination rate,relative germination index,relative vigor index,embryo roots growth were inhibited in diferent degrees under－0. 2 MPa and－0. 3 MPa osmotic potential,germination drought resistance index (GDRI) under two kinds of concentration were positively correlated (r =0. 759^* ). By cluster and correlation analysis of GDRI and the other indices,we thought that PEG-6000 with osmotic potential from－0. 2 MPa to－0. 3 MPa could be used for drought resistance identification,it cleared identification indexes system of drought resistance at germination stage,laid the foundation of comprehensively evaluated drought resistance of tomoto varieties.

Key words: Tomota, Germination stage, Identification index for drought resistance, Osmotic stress

中图分类号: 

• S641.2