八个木薯品种(系)储藏根采后耐贮性生化指标的变化

选用8个木薯品种(系)调查和评价储藏根采后3、7、12、17和27 d贮藏保鲜过程，发现其耐贮存性从高至低依次为SMH、BRA755、SC205、SC5、BRA440、7G-2、T1和BRA258。利用线性回归分析表明，木薯储藏根贮存变质抗性与干物质含量呈负相关，相关系数r为0.687 (P=0.05)；与淀粉率含量呈负相关，相关系数r为0.696 (P=0.05)；与储藏根氢氰酸(HCN)含量无相关性。其中SMH贮存变质抗性最强，储藏根干物质和淀粉含量最低；BRA258和T1贮存变质抗性最差，干物质和淀粉含量最高，因此这3个木薯品种(系)在育种上具有较高的利用价值。

Biochemical Indicators for Storability of Eight Cassava (Manihot esculenta Crantz) Tuberous Roots in Postharvest Storage Process

Cassava (Manihot esculenta Crantz) is an important food and bio-energy crop, which grows in marginal land by subsistent farmers in tropics and subtropics. Cassava contains abundant starch in its tuberous roots, but easily turns rot after harvest, which greatly affects storage life and subsequent starch processing. In this study, tuberous roots of eight varieties (lines) were evaluated at 3, 7, 12, 17, and 27 days after harvest. The results showed that storability of tuberous roots was SMH>BRA755>SC205>SC5> BRA440>7G-2>T1>BRA258. The association between the storability and each of dry matter, starch content, and HCN content was evaluated by a linear regression analysis. There were negative correlation of storability with dry matter (r=0.687, P=0.05) and starch content (r=0.696, P=0.05), and no correlation between the storability and HCN content. In addition, SMH showed the higher storability, lower dry matter and starch content, but BRA258 and T1 showed lower storability, higher dry matter and starch content. These special genotypes should be useful for cassava breeding in the future.