摘要
对4种木瓜Carica papaya Linn新品种台农2号(TL2)、台农6号(TL6)、龙珠(LZ)和夏威夷(H)的呼吸作用进行了观测,结果表明:①净光合速率高的呼吸速率也强。净光合速率(A_n)4个品种高低排列依次为H≥TL2≥TL6≥LZ,而暗呼吸速率(R_d)为H≥TL6≥TL2≥LZ。R_d/A_n从高到低依次排列为LZ≥TL6≥H≥TL6。②通过网室内4种木瓜的光合量子产量比较LZ≥H≥TL6≥TL2,结合其暗呼吸速率光合速率,说明LZ的耐荫性最好,而H则应该较为喜阳。其它种则差异不显著。③呼吸速率与光强呈显著正相关,而光强过高时则下降,呼吸速率与气温呈显著负相关(P≤0.05)。④网室栽培有助于木瓜避开华南地区中午高温、强光以及高湿的胁迫,避免“午休”,减少呼吸损失,积累更多碳同化产物。
The respiration of the four new genotypes of Carica papaya Linn (TL2, TL6, H and LZ) was measured, the results showed that: (1)The dark respiration rate (Rd) increased coupled with the photosynthetic rate (An). The values of An arranged in this sequence: H≥TL2≥TL6≥LZ, (Rd) H≥TL6≥TL2≥LZ and Rd/An LZ ≥ TL6 3≥H ≥ TL6. (2)The quantum yield efficiency of the four genotypes arranged in the sequence of LZ>H>TL6>TL2, combined with their Rd and An, it could infer that LZ was the most shade-tolerant genotype and H was a sunny genotype, but the other two genotypes had no significant differences (P<0.05). (3)Rd had the positive relationship with PFD, but PFD increased to more than 1500 μmol-m-2·s-1 , Rd reduced, Rd also significantly related positively with 0 (P<0.05). (4) Network will be helpful for C.papaya escape from high temperature, PFD and high humidity, release from 'noon break', reduce the damage by respiration, increase the carbon fixation and the production.
出处
《中山大学学报(自然科学版)》
CAS
CSCD
北大核心
2003年第A19期211-214,共4页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家重点基础研究发展资助项目(G2000046803)
广东省自然科学基金重点发展(021536)
广东省科技厅国际合作资助项目(2002B50802)
广东省科技厅工程资助项目(2KB068015)