Table 1. Life table parameters of Bombyx mori larvae when fed pollen from Cry1C- or Cry2A-expressing Bt rice or pollen from the corresponding non-transformed varieties.
Parameter | No. of pollen grains/cm2 leaf | Short-term assay1 | Long-term assay2 | ||||
Control pollen | Cry1C pollen | Cry2A pollen | Control pollen | Cry1C pollen | Cry2A pollen | ||
Larval weight (mg) | 0 | 400.91±14.70 a | 400.91±14.70 a | 400.91±14.70 a | 400.91±14.70 a | 400.91±14.70 a | 400.91±14.70 a |
50 | 394.98±13.42 a | 399.64±17.07 a | 389.49±22.92 a | 404.18±12.18 a | 380.03±5.31 a | 384.13±22.84 a | |
150 | 410.48±10.80 a | 398.88±4.62 a | 383.40±10.56 a | 415.31±9.41 a | 366.86±8.41 a* | 371.34±6.98 a* | |
450 | 396.30±12.12 a | 388.54±23.64 a | 375.96±25.52 a | 410.00 ±11.49 a | 356.02±2.64 a* | 359.17±5.18 a* | |
1800 | 385.45±4.09 a | 386.24±18.18 a | 388.89±4.21 a | 412.40±8.82 a | 347.25±17.51 a* | 354.32±4.69 a* | |
Larval developmental time (d) | 0 | 26.99±0.37 a | 26.99±0.37 a | 26.99±0.37 a | 26.99±0.37 a | 26.99±0.37 a | 26.99±0.37 a |
50 | 26.67±0.49 a | 27.00±0.21 a | 27.41±0.16 a | 27.33±0.24 a | 27.70±0.12 a | 27.27±0.12 a | |
150 | 26.97±0.28 a | 27.57±0.20 a | 27.67±0.15 a | 27.47±0.19 a | 27.83±0.09 a | 28.07±0.30 b | |
450 | 27.60±0.12 a | 27.83±0.13 a | 27.27±0.19 a | 27.57±0.24 a | 28.90±0.15 b* | 28.37±0.15 b | |
1800 | 27.30±0.15 a | 27.53±0.07 a | 27.45±0.23 a | 27.90±0.40 a | 29.63±0.15 b* | 29.17±0.35 b | |
Pupation rate (%) | 0 | 86.67±3.57 a | 86.67±3.57 a | 86.67±3.57 a | 86.67±3.57 a | 86.67±3.57 a | 86.67±3.57 a |
50 | 90.00±0.00 a | 85.00±2.89 a | 81.67±1.67 a | 80.00±2.89 a | 80.00±2.89 ab | 85.00±2.89 a | |
150 | 83.33±1.67 a | 83.33±4.41 a | 83.33±1.67 a | 81.67±1.67 a | 73.33±1.67 ab | 71.67±3.33 ab | |
450 | 78.33±3.33 a | 80.00±5.00 a | 81.67±6.01 a | 76.67±1.67 a | 73.33±1.67 ab | 75.00±2.89 ab | |
1800 | 80.00±0.00 a | 81.67±3.33 a | 70.00±2.89 a | 71.67±3.33 a | 66.67±1.67 b | 65.00±2.89 b | |
Eclosion rate (%) | 0 | 73.33±2.47 a | 73.33±2.47 a | 73.33±2.47 a | 73.33±2.47 a | 73.33±2.47 a | 73.33±2.47 a |
50 | 48.33±1.67 b | 53.33±1.67 b | 48.33±4.41 b | 45.00±2.89 b | 38.33±6.01 b | 41.67±4.41 b | |
150 | 41.67±4.41 b | 35.00±2.89 c | 28.33±3.33 c | 31.67±4.41 bc | 18.33±6.01 c | 28.33±4.41 bc | |
450 | 41.67±6.01 b | 30.00±5.00 c | 31.67±4.41 c | 30.00±2.89 bc | 6.67±1.67 c* | 25.00±2.89 c | |
1800 | 33.33±1.67 b | 30.00±2.89 c | - | 23.33±6.01 c | 1.67±1.67 c* | 3.33±1.67 d* |
Values are means ± SE, n = 3.
Neonates of B. mori were fed mulberry leaves covered with rice pollen for the first 3 d and were then fed mulberry leaves without rice pollen until pupation.
Neonates of B. mori were fed mulberry leaves covered with rice pollen for their entire larval stage.
“-” denotes lost data.
For each parameter, means in a column followed by different letters are significantly different (one-way ANOVAs with Tukey tests for larval weight, pupation and eclosion rate; Kruskal-Wallis Tests followed by Mann-Whitney U-Tests for larval development time).
An asterisk denotes a significant difference between the Bt pollen treatment and the corresponding non-Bt pollen treatment at the same pollen dose (Dunnett test).