Effects of 1-Methylcyclopropene and Controlled Atmosphere on Ethylene Synthesis and Quality Attributes of Avocado cvs. Edranol and Fuerte

Table 8

Evaluation of physiological disorders in “Fuerte” avocado under different storage conditions for 30 and 50 days at 5°C. RA: regular air (85% relative humidity); CA: controlled atmosphere (4% O₂ + 6% CO₂); 1-MCP: 1-methylcyclopropene (300 ppb); s.d: standard deviation. I: early maturity stage; II: advanced maturity stage. D: days at 5°C. SL (shelf life): fruit storage at 20°C. Fruit at SL was evaluated at the same flesh firmness level. Each value corresponds to mean of 35 fruits. Different letters within each storage time and harvest represent significant differences at as determined by the LSD test.

Variable

Harvest

Treatment

Storage time (days)

30 d

30 + SL

50 d

50 + SL

Mean

±

SD

Mean

SD

Mean

SD

Mean

SD

External damage (%)

I

RA

6.7

±

11.6^a

10.5

±

8.3^b

4.8

±

3.3^b

18.1

±

4.4^b

CA

0.0

±

0.0^a

1.9

±

3.3^ab

0.0

±

0.0^a

3.8

±

1.7^a

RA + 1-MCP

0.0

±

0.0^a

1.0

±

1.7^a

3.8

±

1.6^b

13.3

±

1.7^b

II

RA

0.0

±

0.0^a

5.7

±

5.7^a

0.0

±

0.0^a

6.7

±

5.9^a

CA

0.0

±

0.0^a

7.6

±

3.3^a

1.9

±

3.3^a

9.5

±

6.6^ab

RA + 1-MCP

0.0

±

0.0^a

23.8

±

3.3^b

3.8

±

6.6^a

24.8

±

9.2^b

Gray pulp (%)

I

RA

1.9

±

1.7^b

17.1

±

5.0^b

19.0

±

6.0^b

58.1

±

8.7^b

CA

0.0

±

0.0^a

2.9

±

2.9^a

0.0

±

0.0^a

4.8

±

8.3^a

RA + 1-MCP

0.0

±

0.0^a

0.0

±

0.0^a

5.7

±

7.6^a

6.7

±

6.6^a

II

RA

9.5

±

8.7^b

38.1

±

6.0^b

24.8

±

1.7^b

63.8

±

7.2^c

CA

0.0

±

0.0^a

2.9

±

0.0^a

0.0

±

0.0^a

32.4

±

9.2^b

RA + 1-MCP

0.0

±

0.0^a

2.9

±

2.9^a

0.0

±

0.0^a

12.4

±

5.9^a

Vascular browning (%)

I

RA

0.0

±

0.0^a

1.0

±

1.7^a

1.0

±

1.7^a

16.2

±

6.6^b

CA

0.0

±

0.0^a

0.0

±

0.0^a

0.0

±

0.0^a

3.8

±

1.7^a

RA + 1-MCP

0.0

±

0.0^a

3.8

±

6.6^a

2.9

±

2.9^a

10.5

±

3.3^ab

II

RA

5.7

±

9.9^a

21.9

±

13.5^b

17.1

±

7.6^b

48.6

±

12.5^b

CA

0.0

±

0.0^a

9.5

±

3.3^a

2.9

±

0.0^a

11.4

±

5.7^a

RA + 1-MCP

3.8

±

1.7^a

21.0

±

6.0^b

3.8

±

3.3^a

17.1

±

7.6^a

Interaction

External damage (%)

Gray pulp (%)

Vascular browning (%)

Treatment (A)

0.0056

<0.0001

<0.0001

Storage time (B)

<0.0001

<0.0001

<0.0001

Harvest (C)

0.535

0.0004

<0.0001

A × B

0.3752

0.0001

0.0323

A × C

<0.0001

0.0922

0.0114

B × C

0.0055

0.0031

0.0053

A × B × C

0.153

0.0064

0.2605

Factor: Treatment: RA, CA, and RA + 1-MCP. Storage time: fruits storage for 30 and 50 days at 5°C. Harvest: two harvest, early, and advanced maturity stages. Sample significant.