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The results showed that, it  described a general trend of descending in germination potential and vital index, the  germination rate and germination index increased prior to decreasing  with the increase of  Cu2+ concentration, and the maximum values were reached at 40 mg/L, which indicated that lower Cu2+ concentration could promote the germination rate and germination index,  had inhibitory effect at high concentration, when concentration reached 520 mg/L, the seed hardly germinated, even several luck seeds  germinated, its cotyledons, radicle and hypocotyl were showed the copper intoxicating phenomenon with red.
With  the increase of  Cu2+ concentration, the inhibiting effects to radicle and hypocotyl were gradually strengthened, and the  inhibiting effects to  hypocotyl were more obvious.

Key words:  Cu2+, stress,  pitaya, seed germination, germination rate, germination potential


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4Â¥2015-05-31 21:39:36
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The effect of Cu2+ stress on germination of pitaya seed

Using pitaya seed as research material, 6 Cu2+ concentrations (20¡¢40¡¢80¡¢160¡¢320¡¢520 mg/L) and  control treatment were set to thermostasis culture in experimental temperature £¨25+2¡æ£©.
For discussing the influencing causes of  Cu2+ stress on germination of pitaya seed, the germination rate, germination potential, vital index, germination index and radicle and hypocotyl growth of  pitaya seed  germination were observed and analyzed ueder different  Cu2+ concentrations.
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2Â¥2015-05-31 09:55:39
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ÑÌ×ÓÓï²è: ½ð±Ò+30, ·­ÒëEPI+1 2015-06-13 21:32:27
The results showed that, it  described a general trend of descending in germination potential and vital index, the  germination rate and germination index increased prior to decreasing  with the increase of  Cu2+ concentration, and the maximum values were reached at 40 mg/L, which indicated that lower Cu2+ concentration could promote the germination rate and germination index,  had inhibitory effect at high concentration, when concentration reached 520 mg/L, the seed hardly germinated, even several luck seeds  germinated, its cotyledons, radicle and hypocotyl were showed the copper intoxicating phenomenon with red.
With  the increase of  Cu2+ concentration, the inhibiting effects to radicle and hypocotyl were gradually strengthened, and the  inhibiting effects to  hypocotyl were more obvious.

Key words:  Cu2+, stress,  pitaya, seed germination, germination rate, germination potential
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