Study on Morphological Traits and Adaptability of Round up Tolerance Corn: NK603;
in Glasshouse
Prawit Puddhanon1, Thaddoa Anantachaiyong2, Santhanee Ratichumkul2 and Sumate Khunthong2
1
/ Department of Agronomy, Maejo University, Chiang mai, Chiang Mai. Thailand.2/ Monsanto Thailand Ltd.
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The morphological study on modified corn, NK603, compared to non-genetically modified corn; C919; and standard variety, NS 1 and DK 888, was carry out in a glass house during late rainy season in 2001. The randomised complete Block Design (RCB) of 4 varieties; 6 replications, growing 20 plants/plot. It was found that seedling of NK603 and C919 were more vigorous than the seedling of NS1 and DK888. No incidence of downy mildew disease was observed during vegetative growth stage. For flowering date, NK603, C919 and NS1 were almost the same maturity with 50% tasselling date at 57, 57, and 58 days, respectively. But significantly difference from 61 days of DK888. Similar to plant height, NK603, C919, NS1, and DK888 gave average plant height of 240 cm. and the average ear height of NK603, C919, and NS1 was 114 cm. Number of leaves per plant at flowering were not significantly difference among NK603, C919 and NS 1 with average of 11 leaves compared to 13 leaves in late maturity variety, DK888. All varieties had produced ears in the reproductive stage but there were not any seed set due to high plant population density which was double to the recommendation of 8,533 plant per rai. As a result, there were not significantly difference in grain yield. In conclusion, the genetically modified corn, NK603, variety; C919 and standard variety, NS1 were similar in growth and development, silking date, plant and ear height, number of leaves, ear number as well as seed set. A slightly difference in tasselling date, ear height, number of leaves and harvested ears that observed in DK888 was due to late maturity variety group.
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Table 1 Means of agronomic characters of 4 maize varieties, evaluated in glasshouse at Maejo University in 2001 LR. |
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Variety |
Seedling |
No. of |
No. of DM |
Days to 50% |
Height (cm) |
No. of leaves |
No. of ears |
Wt. Of ear |
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|
Vigour(1-5)1 |
Plants |
Plants |
Tassel |
Silking |
Plant |
Ear |
below ear |
harvested |
(gm.) |
|
|
NK603 |
5.0 |
20.0 |
0 |
57.5 b |
64.3 |
241.3 |
116.1 b |
5.5 b |
15.7ab |
32.3 |
|
C919 |
5.0 |
19.8 |
0 |
57.0 b |
64.8 |
239.1 |
109.5 b |
5.6 b |
14.8 b |
48.8 |
|
NS 1 |
3.5 |
19.5 |
0 |
58.5 b |
65.2 |
229.9 |
117.4 b |
5.5 b |
16.7 ab |
58.0 |
|
DK888 |
3.7 |
19.5 |
0 |
61.8 a |
65.7 |
251.8 |
140.6 a |
8.0 a |
21.0 a |
38.5 |
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CV (%) |
- |
2.7 |
- |
1.6 |
3.6 |
5.7 |
4.0 |
5.5 |
18.1 |
48.9 |
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Means follow by the same letter within the column are not significantly difference at p<0.05 by DMRT. |
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1 seedling vigour rating: 1 = Weakest; 2 = Weak; 3 = Moderately strong; 4 = Strong; 5 = Strongest. |
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Note : 1 rai = 0.16 ha.