M.Osei-Kwarteng, I. Napp, D. P. Moualeu & H. Stutzel 1 - - PowerPoint PPT Presentation

Quantifying Architectural Traits of Amaranths (Amaranthus spp) by 3-Dimensional Digitisation

M.Osei-Kwarteng, I. Napp, D. P. Moualeu & H. Stutzel

Institute of Horticultural Poduction Systems Vegetables Systems Modelling

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A.cruentus : Ex Zim – Vegetable

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A.hypochondriacus : TSM -102 (Grain )

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A.tricolor: Arkasuguna (Vegetable –Asian)

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• A. dubius (Mombo 2)

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Growth processes

Environmental and factors Management practices

Productivity

Function (Physiological process) Structure/Architecture

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A.cruentus A.dubius A.hypochondriacus A.tricolor

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Objective:

Quantify architectural traits in four Amaranthus spp and relate them to their dry matter yield

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Architectural traits : leaf size (length and width) , leaf shape, leaf orientation angles ( inclination and azimuth) and internode length.

• Grown under non limiting nutrient and water conditions
• Spacing: 30 cm x 30 cm isometric
• Duration: May-June 2015 on the field
• Location: Institute of Horticultural Production Systems, Hannover (52°2’ N)

Germany

• Experimental design: Randomized complete block (RCBD)
• Statistical analysis: Analysis of variance procedure (SAS,2003)

Materials and Methods

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Materials and Methods

Digitising: Plants were digitised acropetally in a standardized sequence

• Leaves were digitised with 9 points
• A node was the point of attachment of a leaf petiole on the stem
• Internode was the interval between two nodes
• Four plants were digitised per genotype

3-D Fastrak magnetic digitiser Electronic unit

Transmitter

Receiver/pointer

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Digitising plants

Preliminary results

Leaf inclination angle (degrees) 10-20 20-30 30-40 40-50 50-60 60-70 Proportion of leaves 0.0 0.1 0.2 0.3 0.4 0.5 A.tricolor. Mean : 49.2o. S.D : 16.4o A.dubius. Mean : 42.2o. S.D. : 8.2o A.hypochondriacus. Mean : 51.4o . S.D. : 10.4o A.cruentus. Mean : 43.8o. S.D. : 10.4o

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Preliminary results

SEM : 5.67 Acropetal leaf rank 1 2 3 4 5 6 Leaf area (cm2) 10 20 30 40 50 60 70 d cd d e d cd c e cd d d d de de b de cd cd de de cd a de de

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Preliminary results

SEM : 5.67 Acropetal leaf rank 1 2 3 4 5 6 Leaf area (cm2) 10 20 30 40 50 60 70 d cd d e d cd c e cd d d d de de b de cd cd de de cd a de de

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SEM : 0.55 Acropetal leaf rank 1 2 3 4 5 6 Petiole length (cm) 2 4 6 8 10 12 c bab c cd b ab c cd b a c d cb ab c d cb a c d b a c

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• Young plants of A. tricolor have leaves equally

distributed from being fairly horizontal to vertical in

• rientation.
• Young plants of A tricolor and A cruentus exhibit low

leaf areas across existing leaf positions with A. tricolor displaying low petiole length.

• The fifth acropetal leaves of A. hypochondriacus have

large leaf area and longer petioles than the other genotypes

• Significant interaction effects exist between leaf

position and some leaf dimensions

Conclusion

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• Analyse other architectural traits and construct a 3D static

model plant from digitised data

• Relate the angular distribution and projected leaf area of

genotypes to light interception

• Relate differences in architectural traits to dry matter yield

Outlook

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Thank You For Your Attention !!!!

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